Bump github-pages from 209 to 219

[dependabot[bot]]

Bumps github-pages from 209 to 219.

Release notes

Sourced from github-pages's releases.

v218

• Roll back remote themes for gem-based themes #781

v217

• #777 - Upgrade all pages-themes to v0.2.0 (except primer, which is v0.6.0)

NOTE: When building Jekyll locally using one of the Jekyll themes included in GitHub Pages, you will need to upgrade your _config.yml:

-theme: jekyll-theme-hacker
+remote_theme: pages-themes/hacker@v0.2.0
+plugins:
+  - jekyll-remote-theme

v216

• #772 – Remove gem-based themes, replace with remote themes
• #774 – Use Ruby 2.7.3

NOTE: When building Jekyll locally using one of the Jekyll themes included in GitHub Pages, you will need to upgrade your _config.yml:

-theme: jekyll-theme-hacker
+remote_theme: pages-themes/hacker@v0.1.1
+plugins:
+  - jekyll-remote-theme

v215

Bump github-pages-health-check to v1.17.2 #771

v214

Update kramdown to 💎 v2.3.1 #766

v213

Bump jekyll-remote-theme to v0.4.3 #761

v212

• Bump github-pages-health-check to v1.17.0 #744
• Minor doc fix github/pages-gem#760
• Use Ruby 2.7.1 in Dockerfile.alpine github/pages-gem#759

v211

Bump rouge to v3.26.0 #747

v210

Upgrade jekyll-seo-tag to v2.7.1 (#723, #751)

Commits

• 50636cb Merge pull request #782 from github/hubot/github-pages-health-check-v1-17-7
• e5f9995 Update github-pages-health-check to 💎 v1.17.7
• 518c56c Bump :gem: to v218
• d966ac6 Merge pull request #781 from github/revert-to-gem-based-themes
• 0a269c2 Roll back remote themes for gem-based themes
• 17e1f80 Bump :gem: to v217
• 5be1a6b Merge pull request #777 from github/update-theme-versions
• bf8cae0 Upgrade all pages-themes to v0.2.0 (except primer, which is v0.6.0)
• 6430a41 Bump :gem: to v216
• ce2fbb2 Merge pull request #772 from github/remove-gem-themes
• Additional commits viewable in compare view

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