seo: bring meta descriptions into Bing's range, and add IndexNow

Bing Webmaster Tools flags meta descriptions under roughly 90-100
characters. It counts characters, so most Chinese, Japanese and Korean
pages failed even when the text read fine.

- Hand-written descriptions for the key site pages in 11 languages:
  home, pricing, support, team, the blog index and its categories. Plus
  16 docs pages whose text is too short to extend from.
- scripts/fit-meta-descriptions.mjs runs after both builds (v3/build.sh,
  deploy.sh and the docs workflow). It brings every other description to
  120-160 characters, using the page's opening sentences.
- Category descriptions now resolve for the transliterated zh/ja/ko
  slugs. Before, those pages only ever showed the generic text.
- IndexNow: the key file ships with the site from v3/public, and
  scripts/indexnow.mjs submits the live sitemaps. After deploying, each
  workflow submits its own half: the site or the docs.
- Translate the bodies of the Spanish team page and the German support
  page, which were still in English.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.github/workflows/deploy-web.yml

@@ -38,3 +38,9 @@ jobs:
           ./build.sh
           scp x ${{ secrets.NAME }}@${{ secrets.HOST }}:/tmp/
           ssh ${{ secrets.NAME }}@${{ secrets.HOST }} "sudo tar xzf /tmp/x -C /var/www/html/v3 && /bin/rm /tmp/x && sudo chown www-data:www-data /var/www/html/v3 -R"
+
+      # Ask Bing to recrawl the site's pages now. The site is already live, so
+      # a failure here is reported but does not fail the deploy.
+      - name: IndexNow
+        continue-on-error: true
+        run: node scripts/indexnow.mjs site