chore: deploy to Cloudflare Pages and update branding

- Add Cloudflare Pages deployment for landing page (snapotter.com) and
  docs (docs.snapotter.com)
- Create deploy-landing.yml and update deploy-docs.yml workflows
- Update CI to ignore apps/landing/** paths
- Fix logo transparency (remove white background) across all apps
- Recreate social-preview.png with SnapOtter branding
- Update all docs URLs from GitHub Pages to docs.snapotter.com
- Update VitePress config: light theme default, fix llms.txt paths
- Add .vitepress/cache/ and .env.* to gitignore

.github/workflows/deploy-docs.yml

@@ -1,4 +1,4 @@
-name: Deploy Docs to GitHub Pages
+name: Deploy Docs to Cloudflare Pages
 
 on:
   push:
@@ -7,48 +7,32 @@ on:
       - "apps/docs/**"
   workflow_dispatch:
 
-# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
-permissions:
-  contents: read
-  pages: write
-  id-token: write
-
-# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
 concurrency:
-  group: pages
-  cancel-in-progress: false
+  group: deploy-docs
+  cancel-in-progress: true
 
 jobs:
-  build:
+  deploy:
+    name: Deploy
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-      - name: Setup pnpm
-        uses: pnpm/action-setup@v4
-      - name: Setup Node
-        uses: actions/setup-node@v4
+      - uses: actions/checkout@v4
+
+      - uses: pnpm/action-setup@v4
+
+      - uses: actions/setup-node@v4
         with:
           node-version: 22
           cache: pnpm
-      - name: Install dependencies
-        run: pnpm install --frozen-lockfile
-      - name: Build Docs
-        run: pnpm --filter @ashim/docs docs:build
-      - name: Upload artifact
-        uses: actions/upload-pages-artifact@v3
-        with:
-          path: apps/docs/.vitepress/dist
 
-  deploy:
-    environment:
-      name: github-pages
-      url: ${{ steps.deployment.outputs.page_url }}
-    needs: build
-    runs-on: ubuntu-latest
-    steps:
-      - name: Deploy to GitHub Pages
-        id: deployment
-        uses: actions/deploy-pages@v4
+      - run: pnpm install --frozen-lockfile
+
+      - name: Build Docs
+        run: pnpm --filter @snapotter/docs docs:build
+
+      - name: Deploy to Cloudflare Pages
+        uses: cloudflare/wrangler-action@v3
+        with:
+          apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
+          accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
+          command: pages deploy apps/docs/.vitepress/dist --project-name snapotter-docs --branch main --commit-dirty=true