fix: dead links breaking check-links CI on every push/PR (#15)

Diagnosed from the failing "Check Links" workflow on PR #14 (already
merged, non-blocking, but failing on every push/PR/weekly-schedule run
since the workflow scans the whole repo, not just changed files).

- mlc_config.json: add 403 and 429 to aliveStatusCodes. Several legitimate
  sites (datacamp.com, udemy.com, deeplearning.ai, madewithml.com,
  snowflake.com, data.cityofnewyork.us) block automated link checkers with
  403 even though they're live for real visitors -- the standard fix for
  this class of false positive.
- 4 Hugging Face dataset links (SST-2, AG News, SQuAD 2.0, MultiNLI) used
  old un-namespaced URLs; HF now requires the owner-namespaced path.
  Verified each new URL resolves before changing it.
- Think Bayes moved from greenteapress.com/thinkbayes2/ to
  greenteapress.com/wp/think-bayes/.
- dbt certification page (getdbt.com/dbt-learn/dbt-certification/) 404s;
  pointed at the still-live getdbt.com/dbt-learn instead.
- RI DLT's WARN Act page moved off the warn.dlt.ri.gov subdomain (DNS
  failure, status 0) to dlt.ri.gov/employers/... -- verified via search,
  the new page is real and indexed even though it also 403s automated
  fetchers (covered by the aliveStatusCodes fix above).
- 3 internal links (README.md x2, PROGRESS.md) pointed to
  08_Career_Guide/salary_guide.md, which doesn't exist -- the file lives
  at 00_Overview/salary_guide.md. Looks like a file move that never got
  its inbound links updated.

Author: Viraj97-SL

.github/mlc_config.json

@@ -14,5 +14,5 @@
   "retryOn429": true,
   "retryCount": 3,
   "fallbackRetryDelay": "30s",
-  "aliveStatusCodes": [200, 206, 301, 302, 307, 308]
+  "aliveStatusCodes": [200, 206, 301, 302, 307, 308, 403, 429]
 }

00_Overview/salary_guide.md

@@ -200,7 +200,7 @@
 - **[Blind](https://teamblind.com)** — Anonymous tech salary discussions
 - **[BuiltIn Cities](https://builtin.com/salaries)** — Tech salaries by city
 - **[H1B Salary Database](https://h1bdata.info)** — Public data from visa filings (very accurate)
-- **[WARN Act Notices](https://warn.dlt.ri.gov)** — Layoff data to understand market health
+- **[WARN Act Notices](https://dlt.ri.gov/employers/worker-adjustment-and-retraining-notification-warn)** — Layoff data to understand market health
 
 ---
 

07_Resources/books.md

@@ -13,7 +13,7 @@
 | 1 | Python Data Science Handbook | Jake VanderPlas | Beginner-Int | [Yes (GitHub)](https://github.com/jakevdp/PythonDataScienceHandbook) | Best intro to numpy/pandas/matplotlib/sklearn |
 | 2 | Python for Data Analysis | Wes McKinney | Beginner-Int | No (cheap) | The definitive pandas book — by the creator |
 | 3 | Think Stats | Allen Downey | Beginner | [Yes (free)](https://greenteapress.com/thinkstats2/) | Statistics with Python, programmer-friendly |
-| 4 | Think Bayes | Allen Downey | Intermediate | [Yes (free)](https://greenteapress.com/thinkbayes2/) | Bayesian statistics in Python — excellent |
+| 4 | Think Bayes | Allen Downey | Intermediate | [Yes (free)](https://greenteapress.com/wp/think-bayes/) | Bayesian statistics in Python — excellent |
 | 5 | Naked Statistics | Charles Wheelan | Beginner | No | Non-technical, great for intuition |
 | 6 | The Art of Statistics | David Spiegelhalter | Beginner-Int | No | Modern, readable statistics book |
 | 7 | Data Science from Scratch | Joel Grus | Beginner-Int | No | Implements DS algorithms from scratch — great for understanding |

07_Resources/courses.md

@@ -329,7 +329,7 @@
 ---
 
 ### 🏅 dbt (data build tool)
-> **Certification:** https://www.getdbt.com/dbt-learn/dbt-certification/
+> **Certification:** https://www.getdbt.com/dbt-learn
 > **Free prep:** dbt Learn (https://courses.getdbt.com) — official free courses
 
 | Certification | Cost | Best For |

07_Resources/datasets.md

@@ -37,10 +37,10 @@
 | Dataset | Size | Task | Link | Notes |
 |---------|------|------|------|-------|
 | **IMDB Reviews** | 50K reviews | Sentiment | [Hugging Face](https://huggingface.co/datasets/imdb) | Binary sentiment benchmark |
-| **SST-2** | 67K sentences | Sentiment | [Hugging Face](https://huggingface.co/datasets/sst2) | Stanford fine-grained sentiment |
-| **AG News** | 120K articles | Text classification | [Hugging Face](https://huggingface.co/datasets/ag_news) | 4-class news categorization |
-| **SQuAD 2.0** | 150K Q&A pairs | Extractive QA | [HF Datasets](https://huggingface.co/datasets/squad_v2) | Reading comprehension |
-| **MultiNLI** | 433K pairs | NLI / Entailment | [Hugging Face](https://huggingface.co/datasets/multi_nli) | Sentence pair classification |
+| **SST-2** | 67K sentences | Sentiment | [Hugging Face](https://huggingface.co/datasets/stanfordnlp/sst2) | Stanford fine-grained sentiment |
+| **AG News** | 120K articles | Text classification | [Hugging Face](https://huggingface.co/datasets/fancyzhx/ag_news) | 4-class news categorization |
+| **SQuAD 2.0** | 150K Q&A pairs | Extractive QA | [HF Datasets](https://huggingface.co/datasets/rajpurkar/squad_v2) | Reading comprehension |
+| **MultiNLI** | 433K pairs | NLI / Entailment | [Hugging Face](https://huggingface.co/datasets/nyu-mll/multi_nli) | Sentence pair classification |
 | **CommonCrawl** | Petabytes | Pre-training | [commoncrawl.org](https://commoncrawl.org/) | Raw web text |
 | **Wikipedia** | 6.7M articles | QA, summarization | [HF Datasets](https://huggingface.co/datasets/wikipedia) | High-quality text |
 | **Amazon Reviews** | 82M reviews | Sentiment, recommendation | [UCSD JMCAULEY](https://nijianmo.github.io/amazon/) | Product review analysis |

PROGRESS.md

@@ -233,7 +233,7 @@
 - [ ] Created a portfolio GitHub README
 - [ ] Published at least 3 projects on GitHub
 - [ ] Updated LinkedIn with new skills
-- [ ] Read [Salary Guide](08_Career_Guide/salary_guide.md) for my target role
+- [ ] Read [Salary Guide](00_Overview/salary_guide.md) for my target role
 - [ ] Joined at least 1 community (Discord, Slack, etc.)
 
 ---

README.md

@@ -65,7 +65,7 @@ The internet is full of scattered tutorials. This repo is different:
 | Preparing for Kaggle / competitions | [Competitions →](09_Competitions/) |
 | Brainstorming for a Hackathon | [Hackathons →](10_Hackathons/) |
 | Want the bleeding-edge trends | [Recent Topics →](11_Recent_Topics/) |
-| Negotiating a salary | [Salary Guide →](08_Career_Guide/salary_guide.md) |
+| Negotiating a salary | [Salary Guide →](00_Overview/salary_guide.md) |
 
 
 
@@ -203,7 +203,7 @@ Thanks to RepoSentinel's cross-run memory and self-improvement loop, this Learni
 
 ## Career Resources
 
-- **[Salary Guide 2025/2026](08_Career_Guide/salary_guide.md)** — Compensation by role, level, location
+- **[Salary Guide 2025/2026](00_Overview/salary_guide.md)** — Compensation by role, level, location
 - **[Interview Prep](06_Interview_Prep/)** — 200+ questions with answers by role
 - **[Portfolio Guide](08_Career_Guide/portfolio_guide.md)** — How to stand out to hiring managers
 - **[Resume Templates](08_Career_Guide/resume_guide.md)** — ATS-friendly templates per role