feat: improve mappings, move custom/init.lua & chadrc.lua -> custom/example_init.lua & example_chadrc.lua

lua/custom/init.lua

@@ -1,11 +0,0 @@
--- This is where you custom modules and plugins goes.
--- See the wiki for a guide on how to extend NvChad
-
-local hooks = require "core.hooks"
-
--- For example, the hook below overrieds 'publish_diagnostics' in the 'lspconfig' file,
--- 
--- hooks.override("lsp", "publish_diagnostics", function(current)
---   current.virtual_text = false;
---   return current;
--- end)