Clear out Logseq lineage, re-license to Apache-2.0 (#13)

Same shape as the previously-open PR #10 (closed in favor of doing
this on top of the BizerBrain rename). Removes ~427k lines of
upstream Logseq code that the current build doesn't consume, and
replaces the inherited AGPL-3.0 LICENSE.md with Apache-2.0 LICENSE.

Removed (~1,768 files):
- src/, deps/, public/, resources/, scripts/, externs/, externs.js,
  libs/, prompts/, bin/, icons/, assets/, dist/
- android/, ios/, fastlane/, capacitor.config.ts
- clj-e2e/, cli-e2e/
- bb.edn, deps.edn, shadow-cljs.edn
- gulpfile.js, postcss.config.js, tailwind.*, webpack.config.js
- Root Logseq workspace: package.json, pnpm-lock.yaml
- ssl/, docs/, typos.toml, rebase.md
- Logseq dotfiles: .carve/, .clj-kondo/, .lsp/, .cljfmt.edn,
  .i18n-lint.toml, .projectile, .stylelintrc.json, .prettierrc.js,
  .npmrc
- packages/ui/ (unused by notes-app and file-api)
- Upstream agent skills (.agents/skills/logseq-*, esm-cjs-risk-scan)
- Upstream workflows: build.yml, build-android, build-desktop-release,
  build-ios-release, build-plugin-docs, clj-e2e, clj-rtc-e2e, deploy-*,
  deps-*, update-i18n-lint, pr-labeler, stale-issues
- Upstream .github configs: FUNDING.yml, ISSUE_TEMPLATE/,
  PULL_REQUEST_TEMPLATE/, pr-labeler.yml, stale-issues.yml
- Upstream docs: AGENTS.md, CODEBASE_OVERVIEW.md, CODE_OF_CONDUCT.md,
  CONTRIBUTING.md
- LICENSE.md (AGPL-3.0)

Added/rewritten with BizerBrain branding:
- LICENSE (Apache-2.0)
- README.md (brief description, docker quickstart, agent-skill install)
- Dockerfile header comment

Tightened:
- .gitignore: dropped Clojure-specific entries; scoped to Node + editor noise
- .dockerignore: scoped to actual build inputs

Result: 49 tracked files. Build-Docker inputs (Dockerfile, .dockerignore,
docker/, packages/notes-app, packages/file-api) untouched; image build
remains green.

Co-authored-by: Claude <noreply@anthropic.com>

Author: kelsi-bizer