This allows a more declarative way of defining targets which may be easier to those not familiar with cmake quirks.

Example usage:

# get a list of pre-configured presets
cmake --list-presets

# configure a preset
cmake . --preset=default

# build it
cmake --build --preset=default

The Sumneko Lua language server has matured quite a bit and many
Neovim developers use it while working on Neovim. Having a default
configuration for Neovim development is a nice convenience (and
dovetails well with the auto-generated compile_command.json for C
development).

The file is shipped under `contrib` and users can make use of it by
symlinking to `.luarc.json` in the project root.

Update runtime files
https://github.com/vim/vim/commit/47e13953ffdbb9f163b901196dec8c2100b72edd

Ignore *.rej files, generated by vim-patch.sh.
Source of mistakes for 1st-time contributors.

I build Vim and Nvim from source and have both repos cloned locally. To prevent
vim-patch.sh from downloading the Vim source once again to /.vim-src/, I usually
use a symlink pointing to the already existing Vim repo.

The pattern "/.vim-src" works for both, a directory or a symlink.

PR https://github.com/neovim/neovim/pull/14063 added it by mistake.

While standard library is cached to a user's directory such as
$XDG_CACHE_HOME, directory-specific clangd indexes are stored to .cache
subdirectory.
https://github.com/llvm/clangd-www/blob/main/design/indexing.md#backgroundindex

- remove redundant autocmd list
  This "grouped" list is useless, it only gets in the way when searching
  for event names.
- intro.txt: cleanup
- starting.txt: update, revisit
- doc: `:help bisect`
- mbyte.txt: update aliases 1656367b90bd. closes #11960
- options: remove 'guifontset'. Why:
  - It is complicated and is used by almost no one.
  - It is unlikely to be implemented by Nvim GUIs (complicated to parse,
    specific to Xorg...).