fix(docs): handle config errors, document rename #4192

Problem:
If a config throws an error it fails the entire doc generation.

Solution:
Handle config error in docgen. Unfortunately, this doesn't show the
error message, it shows:

    loop or previous error loading module 'lsp.volar'

instead of the actual `error('…')` message.

So meanwhile, document the current deprecation/rename pattern and use
`vim.notify()` instead.

1 files changed, 0 insertions, 1 deletions

diff --git a/.gitignore b/.gitignore
index a928eeda..9b959405 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,2 @@
-.luacheckcache
 neovim
 doc/tags