Visual redesign: new hero/nav/footer, PicoCSS styling, refreshed copy

[johngallagher]

Summary

This is a proposal to refresh the look of jruby.org, prototyped first at johngallagher/diamond and ported here. Per the README's note to consult before large changes, I'd like this to be a starting point for discussion rather than something to merge as-is -- happy to iterate or narrow scope based on feedback.

• New hero, nav (with mobile hamburger), and footer, built on a locally vendored PicoCSS (classless) plus a new stylesheets/style.css. Removes the old main.css/carousel.css/ie7-hacks.css and the Typekit font loader (left on disk, just unreferenced).
• Refreshed prose on getting-started, documentation, community, contribute, security, and blogs. I deliberately left nightly and chat untouched -- their current copy (Sonatype Central links, Matrix logs, IRC bridge) is already more accurate/current than what the prototype had, so replacing it would have been a regression.
• Adds a Twitter card back into the Community page grid so /twitter stays linked from somewhere (the prototype had dropped it).

What's deliberately unchanged

• Release automation: rakelib/release.rake's change_versions_in does plain text substitution of version strings in download.html and _config.yml on every release. I restyled download.html by wrapping each release block in a <div class="release-card"> only -- diffed against master to confirm every version string, URL, and bit of release text is byte-for-byte identical otherwise. _config.yml is untouched entirely.
• Favicons/PWA: site.webmanifest, browserconfig.xml, and the existing favicon/touch-icon images are untouched.
• Analytics: the Google Analytics snippet (_includes/tracking.html) is still included on every page in the same position.
• Existing homepage features: the Recent News teaser, Recent Toots Mastodon embed, InfoWorld Bossie award, and Engine Yard hosting credit are all still there, just restyled to match the new look rather than removed.
• _posts/, Rakefile, cookbooks/, conf/, config.ru, patches/, templates/, files/, apidocs/, CNAME, .htaccess, robots.txt, atom.xml, Gemfile -- none of these were touched.
• Old stylesheets/, javascripts/, and images/ are left on disk even where now unreferenced, rather than deleted -- a couple of old posts embed images directly (e.g. jruby-bug-chart-jan-2010.png), and there may be external hotlinks I can't see. Happy to clean these up in a follow-up if maintainers prefer.

One thing to flag explicitly

The footer now includes a "Professional Support" link to Headius Enterprises. This was coordinated directly with the Headius team beforehand -- flagging it here so it's not a surprise in review.

Test plan

• bundle exec jekyll build succeeds with no new warnings (the pre-existing Layout 'nil' requested in atom.xml warning is present on master too)
• Diffed download.html and _config.yml against master to confirm only CSS wrapper divs were added around release blocks, no text/URL changes
• Spot-rendered and checked index.html, download.html, news.html, a _posts entry, security.markdown, and 404.html -- nav links resolve, the release widget shows live site.release data, and the homepage's Mastodon/awards/Engine Yard sections still render
• Would appreciate a maintainer double-checking the live rake deploy/rake server flow, since I could only verify via jekyll build locally

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