feat!(lsp): use ltex-plus instead of ltex

- BREAKING CHANGE: it is now required to install ltex-plus on the
  different machines
- Add some exceptions for `false friends` in English

readme.md

@@ -22,3 +22,11 @@ For instance, you can create clone this repository inside
 ```sh
 export NVIM_APPNAME="$HOME/.config/kicknvim"
 ```
+
+## LSP dependencies
+
+This configuration requires some LSP servers to be installed on your machine
+(usually because they are unavailable in `mason`). These packages are:
+
+- `rust-analyzer`
+- `ltex-ls-plus`