feat: switch to native 0.11 LSP, remove obsolete things

CHEATSHEET.md

@@ -4,6 +4,7 @@
 
 - `;` leader key
 - `:checkhealth [<pluginname>]` check base or plugin status
+- `:checkhealth vim.lsp` show details of LSP attached to buffer
 - `:verbose set expandtab?` check where `expandtab` has been set last
 - `:Lazy` show package manager UI
 - `:Mason` show Mason UI
@@ -49,6 +50,7 @@
 - `Ctrl`+`l` accept selected suggestion
 - `gd` go to definition
 - `gr` show references of function
+- `grn` renames all refs of the symbol under cursor
 - `leader`+`q` toggle `trouble.nvim` quickfix list
 - `leader`+`da` go to next diagnostic (any severity)
 - `leader`+`dw` go to next diagnostic (_warning_ severity)