docs: migrate Sphinx/MyST documentation to Fern

.github/ISSUE_TEMPLATE/model_support_request.yml

@@ -11,7 +11,7 @@ body:
       value: |
         Use this form to request support for a new model. Include the upstream model reference and the minimum deliverables needed to make the request actionable.
 
-        **We encourage you to try adding model support yourself first!** Megatron Bridge includes an [AI-assisted model onboarding guide](../../docs/adding-new-models.md) that walks you through creating bridges, providers, recipes, and tests. Many models share architectural patterns with already-supported families, making self-service onboarding straightforward. If you have a working implementation, please open a PR — we'll help review and merge it.
+        **We encourage you to try adding model support yourself first!** Megatron Bridge includes an [AI-assisted model onboarding guide](../../docs/use-cases/model-development/add-new-model.mdx) that walks you through creating bridges, providers, recipes, and tests. Many models share architectural patterns with already-supported families, making self-service onboarding straightforward. If you have a working implementation, please open a PR — we'll help review and merge it.
   - type: input
     id: hf-repo
     attributes:

README.md

@@ -210,23 +210,23 @@ Megatron Bridge provides out-of-the-box bridges and training recipes for a wide
 
 | Family | Supported variants |
 |----------------|--------------------|
-| [**Bailing**](docs/models/bailing/index.md) | Ling 2.0 (Bailing) |
-| [**DeepSeek**](docs/models/deepseek/index.md) | DeepSeek V2 / V2 Lite, DeepSeek V3, DeepSeek V4 |
-| [**Falcon**](docs/models/falcon/index.md) | Falcon H1 |
-| [**Gemma**](docs/models/gemma/index.md) | Gemma / Gemma 2, Gemma 3, Gemma 3-VL, Gemma 4-VL (26B-A4B MoE) |
-| [**GLM**](docs/models/glm/index.md) | GLM-4.5 / 4.7 / 4.7-Flash, GLM-4.5V, GLM-5 / 5.1 |
-| [**GPT-OSS**](docs/models/gpt_oss/index.md) | GPT-oss |
-| [**Kimi**](docs/models/kimi/index.md) | Kimi K2, Kimi-K2.5-VL |
-| [**Llama**](docs/models/llama/index.md) | Llama 2, Llama 3 / 3.1 / 3.2 / 3.3 |
-| [**MiniMax**](docs/models/minimax/index.md) | MiniMax-M2 / M2.5 / M2.7 |
-| [**Mistral**](docs/models/mistral/index.md) | Mistral, Ministral 3 (3B/8B/14B) |
-| [**Xiaomi-MiMo**](docs/models/mimo/index.md) | Xiaomi-MiMo |
-| [**Moonlight**](docs/models/moonlight/index.md) | Moonlight |
-| [**Nemotron**](docs/models/nemotron/index.md) | Nemotron H, Nemotron Nano v2, Nemotron-3 Nano, Nemotron-3 Super, Llama Nemotron, Nemotron Nano v2 VL, Nemotron-3 Nano Omni |
-| [**OLMoE**](docs/models/olmoe/index.md) | OLMoE |
-| [**Qwen**](docs/models/qwen/index.md) | Qwen2 / Qwen2.5, Qwen3, Qwen3-MoE, Qwen3 Next, Qwen2.5-VL, Qwen3-VL, Qwen3.5-VL, Qwen3.6-VL, Qwen2 Audio, Qwen2.5-Omni, Qwen3-Omni, Qwen3-ASR |
-| [**Sarvam**](docs/models/sarvam/index.md) | Sarvam |
-| [**StepFun**](docs/models/stepfun/index.md) | Step-3.5-Flash |
+| [**Bailing**](docs/models/bailing/index.mdx) | Ling 2.0 (Bailing) |
+| [**DeepSeek**](docs/models/deepseek/index.mdx) | DeepSeek V2 / V2 Lite, DeepSeek V3, DeepSeek V4 |
+| [**Falcon**](docs/models/falcon/index.mdx) | Falcon H1 |
+| [**Gemma**](docs/models/gemma/index.mdx) | Gemma / Gemma 2, Gemma 3, Gemma 3-VL, Gemma 4-VL (26B-A4B MoE) |
+| [**GLM**](docs/models/glm/index.mdx) | GLM-4.5 / 4.7 / 4.7-Flash, GLM-4.5V, GLM-5 / 5.1 |
+| [**GPT-OSS**](docs/models/gpt-oss/index.mdx) | GPT-oss |
+| [**Kimi**](docs/models/kimi/index.mdx) | Kimi K2, Kimi-K2.5-VL |
+| [**Llama**](docs/models/llama/index.mdx) | Llama 2, Llama 3 / 3.1 / 3.2 / 3.3 |
+| [**MiniMax**](docs/models/minimax/index.mdx) | MiniMax-M2 / M2.5 / M2.7 |
+| [**Mistral**](docs/models/mistral/index.mdx) | Mistral, Ministral 3 (3B/8B/14B) |
+| [**Xiaomi-MiMo**](docs/models/mimo/index.mdx) | Xiaomi-MiMo |
+| [**Moonlight**](docs/models/moonlight/index.mdx) | Moonlight |
+| [**Nemotron**](docs/models/nemotron/index.mdx) | Nemotron H, Nemotron Nano v2, Nemotron-3 Nano, Nemotron-3 Super, Llama Nemotron, Nemotron Nano v2 VL, Nemotron-3 Nano Omni |
+| [**OLMoE**](docs/models/olmoe/index.mdx) | OLMoE |
+| [**Qwen**](docs/models/qwen/index.mdx) | Qwen2 / Qwen2.5, Qwen3, Qwen3-MoE, Qwen3 Next, Qwen2.5-VL, Qwen3-VL, Qwen3.5-VL, Qwen3.6-VL, Qwen2 Audio, Qwen2.5-Omni, Qwen3-Omni, Qwen3-ASR |
+| [**Sarvam**](docs/models/sarvam/index.mdx) | Sarvam |
+| [**StepFun**](docs/models/stepfun/index.mdx) | Step-3.5-Flash |
 
 ### Launching Recipes