nvim/lsp/servers: add json,yaml,vim,lua

These were selected as they seem generally useful in everyday usage of
neovim. Vim/Lua is obvious, Json and Yaml is generally useful for
config editing.

nvim/lua/psoxizsh/lsp/servers.lua

@@ -0,0 +1,11 @@
+local util, Server = require 'psoxizsh.lsp.util', require 'psoxizsh.lsp.preset'
+
+-- List of language servers that are enabled by default
+local defaults = {
+  Server.Json,
+  Server.Yaml,
+  Server.Vim,
+  Server.Lua
+}
+
+return util.Servers.new(defaults)