feat(lsp): reimplement automatic installation of language servers

README.md

@@ -63,7 +63,11 @@ when needed.
 
 ### Language servers
 Language servers are installed automatically to the nvim data directory
-(`:echo stdpath('data') .. '/mason'`). The following are some noted requirements
+(`:echo stdpath('data') .. '/mason'`) upon entering a buffer of related
+filetype. Automatic installation can be turned off, see the end of this section
+for instructions.
+
+The following are some noted requirements
 for the installations themselves:
 
 - **diagnostic-languageserver**: npm
@@ -77,9 +81,11 @@ Some servers have additional runtime dependencies:
 
 - **bash-language-server**: shellcheck (optional, used for linting)
 
-If you don't need some specific language server, and want to get rid of any
-warning messages, you may either remove them from the top of `lua/lsp.lua`
-or disable them in `lua/lsp/<server>.lua`.
+If you don't need some specific language server, you may either remove them from
+the top of `lua/lsp.lua` or disable them in `lua/lsp/<server>.lua`.
+
+To disable automatic installation of a selected language server, remove or
+comment out the mason part of the configuration at `lua/lsp/<server>.lua`.
 
 ### Nerd Font
 It's recommended to use a [Nerd Font](https://www.nerdfonts.com/),