No user-visible change in the generated site.
This PR will make generated-site diffs easier to manage when the language homepages are migrated over to use the layout. Also added whitespace cleanup of prog_lang_home partial.
* Language landing page rework
* Use dev-stories heading id
* Add Showcase page
* Elide Java dev stories for now, but keep target
* Tweak showcase dev stories list
* Only show "More..." nav entry for pages that have more content
* Move API-reference links to language-specific pages
* Remove language references from reference page
Note that the page no longer shows up in the left-nav.
* Drop shortcode and data file that aren't used anymore
* Drop reference page
* C# .NET page: make prose match other pages
* gRPC-for-.NET prose tweak
* Eric's feedback: don't add mention of gRPC core in Languages page
* Introduce languages section
* Add Languages to top-nav Docs menu
* Link to Languages page from Docs landing page
* Redirects for quick start and tutorial pages
* Add some leading text for the language list pages
* Tweak Languages list page prose
* Fix language order in Languages page
Patrice Chalin
Patrice Chalin