* Basic cleanup of testimonials
Trimming file: keep only 6 entries. This is meant to be a quick cleanup. (More updates to the site will be coming in subsequent PRs, e.g., to add dev stories.)
- Drop Carbon3D: I can't find any public evidence that they're using gRPC
- Drop University of Wisconsin: not clear that the Open lambda project is still active
- Add dates for all remaining entries
* Also remove images that will no longer be used
* 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
* Kotlin quick start (#124)
* Adjust example directory name in Kotlin quick start (#144)
* Quick start: clone grpc-kotlin repo at HEAD (#145)
* Hello world example: adjust package and class names (#152)
* Revert hello world package name change
* Kotlin quick start: add JDK prerequisite (#156)
* Kotlin tutorial
* Post-review edits
* Kotlin quick start (#124)
* Adjust example directory name in Kotlin quick start (#144)
* Quick start: clone grpc-kotlin repo at HEAD (#145)
* Hello world example: adjust package and class names (#152)
* Revert hello world package name change
* Kotlin quick start: add JDK prerequisite (#156)
* Drop "under development" from Kotlin entry in About page
* Adjust API reference root package name (#175)
* Update Kotlin QS example code, and other tweaks (#194)
* Kotlin quick start: update example code and other tweaks
* A small path fix to the Route Guide page
* Fix Kotlin API reference link in QS page