Add mdx lsp support

lsp/lemminx.lua

@@ -0,0 +1,5 @@
+return {
+  cmd = { "lemminx" },
+  filetypes = { "xml", "xsd", "xsl", "xslt", "svg" },
+  root_markers = { "sfdx-project.json", ".git" },
+}

lsp/lwc_ls.lua

@@ -0,0 +1,7 @@
+-- LWC LSP: install with `npm i -g @salesforce/lwc-language-server`.
+-- Attaches only inside SFDX projects via root marker.
+return {
+  cmd = { "lwc-language-server", "--stdio" },
+  filetypes = { "javascript", "html" },
+  root_markers = { "sfdx-project.json" },
+}

lsp/mdx_analyzer.lua

@@ -0,0 +1,24 @@
+local function tsdk()
+  local local_ts = vim.fs.find("node_modules/typescript/lib", {
+    upward = true,
+    path = vim.fn.expand("%:p:h"),
+    type = "directory",
+  })[1]
+  if local_ts then return local_ts end
+  return vim.fn.stdpath("data")
+    .. "/mason/packages/typescript-language-server/node_modules/typescript/lib"
+end
+
+return {
+  cmd = { "mdx-language-server", "--stdio" },
+  filetypes = { "mdx", "markdown.mdx" },
+  root_markers = { "package.json", "tsconfig.json", ".git" },
+  init_options = {
+    typescript = { tsdk = tsdk() },
+  },
+  capabilities = {
+    workspace = {
+      didChangeWatchedFiles = { dynamicRegistration = false },
+    },
+  },
+}