* removed outdated links
* updated permanent redirections
* updated postgres docs links to current version
* sort links in ecosystems by repo-name
* change http:// to https://
* /index.rst:24: WARNING: Line block ends without a blank line.
* /install.rst:300: WARNING: Explicit markup ends without a blank line; unexpected unindent.
* /admin.rst:273: WARNING: Could not lex literal_block as "http". Highlighting skipped.
* /tutorials/tut1.rst:150: WARNING: Could not lex literal_block as "json". Highlighting skipped.
* Remove extra newline
* Use integer value as epoch in JSON snippet
Even though using a string value is convenient (due to the lack of JSON
comments), it is confusing since the value should actually be an
integer. A slightly more verbose documentation is therefore preferable.
* Updated full-text search
* Calling RPC with GET
* Customizing HTTP status codes and headers
* Move the admin section to bottom of TOC
* Revise JWT signing section of tutorial
* Selecting pkeys in embedding no longer required
