feat: add digestif support (#2568)

lua/lspconfig/server_configurations/digestif.lua

@@ -0,0 +1,28 @@
+local util = require 'lspconfig.util'
+
+local bin_name = 'digestif'
+local cmd = { bin_name }
+
+if vim.fn.has 'win32' == 1 then
+  cmd = { 'cmd.exe', '/C', bin_name }
+end
+
+return {
+  default_config = {
+    cmd = cmd,
+    filetypes = { 'tex', 'plaintex', 'context' },
+    root_dir = util.find_git_ancestor,
+    single_file_support = true,
+  },
+  docs = {
+    description = [[
+https://github.com/astoff/digestif
+
+Digestif is a code analyzer, and a language server, for LaTeX, ConTeXt et caterva. It provides
+
+context-sensitive completion, documentation, code navigation, and related functionality to any
+
+text editor that speaks the LSP protocol.
+]],
+  },
+}