feat: Adding LSP configs for ansiblels, arduino_language_server,

marksman. Adding documentation for LSP configs. Removing Mason config
and the reference to nvim-lspconfig.

nvim/after/lsp/marksman.lua

@@ -1,4 +1,5 @@
 return {
-    cmd = { 'marksman' },
-    filetypes = { 'md', 'markdown', 'telekasten' },
+    cmd = { 'marksman', 'server' },
+    filetypes = { 'markdown', 'markdown.mdx' },
+    root_markers = { '.marksman.toml', '.git' },
 }