Document tala.run, the documentation hosts and the ASP.NET Core API

- README, Architecture and Operations describe the three sites one
  build serves, their routes, the per-host sitemap and robots files,
  forum.tala.run, the permanent redirects of the former domain, and that
  tala.run has no ViGet host.
- The backend sections describe the ASP.NET Core 10 API: how to build,
  test, run and publish it, its lock files, and its place on the server
  in current/site-api beside the legacy process of Progmaweb.
- Development explains ?site=talac and ?site=tazel on a development host
  and lists the new test file; the release and rollback steps label
  current/site-api for SELinux as well.
- The development server proxies /api to port 5086, the port the API
  uses unless PORT says otherwise.

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