feat: add markdown-oxide lsp (#3030)

* feat: add markdown-oxide lsp

* fix: style

* fix: modify root_dir to include git repos

* fix: fix undefined lspconfig error

* fix: style

* fix: use util

Co-authored-by: Raphael <glephunter@gmail.com>

* fix: use find git ancestor

Co-authored-by: Raphael <glephunter@gmail.com>

* Update markdown_oxide.lua

Co-authored-by: Raphael <glephunter@gmail.com>

---------

Co-authored-by: Raphael <glephunter@gmail.com>

lua/lspconfig/server_configurations/markdown_oxide.lua

@@ -0,0 +1,19 @@
+local util = require 'lspconfig.util'
+
+return {
+  default_config = {
+    root_dir = util.find_git_ancestor,
+    single_file_support = true,
+    filetypes = { 'markdown' },
+    cmd = { 'markdown-oxide' },
+  },
+  docs = {
+    description = [[
+https://github.com/Feel-ix-343/markdown-oxide
+
+Markdown language server with advanced linking support made to be completely compatible with Obsidian; An Obsidian Language Server
+
+Check the readme to see how to get nvim-cmp properly working.
+    ]],
+  },
+}