Problem:
`config.lspinfo` is an undocumented feature that allows extending the
info shown in `:LspInfo` (`:checkhealth lspconfig`).
This feature is unwanted because:
- it's undocumented
- it adds a maintenance burden
- it provides info that should be derived from the LSP protocol itself.
Solution:
Remove support for `config.lspinfo`.
Instead, `:LspInfo` (`:checkhealth lspconfig`) should be enhanced to
automatically gather this kind of extra info from the server response.
Problem:
The name `server_configurations` is extremely verbose and irritatingly
formal and dogmatic. This overlong name is a constant nuisance when
reading, writing, and coding.
It's also not even correct: these configurations are just as much
"client" configurations as they are "server" configurations.
Solution:
- Rename to a shorter name.
- Leave placeholder files for any old URLs that link to the old
location.
