refactor: clean & re-organise default_config + chadrc

this completely overhauls the design of the two configuration files,
aiming to move options & various tables into a more sensible table structure

BREAKING CHANGE: this will break any user modificiations to the current
config

lua/plugins/configs/lspconfig.lua

@@ -57,7 +57,7 @@ capabilities.textDocument.completion.completionItem.resolveSupport = {
    },
 }
 
-local servers = require("core.utils").load_config().plugins.lspconfig.servers
+local servers = require("core.utils").load_config().plugins.options.lspconfig.servers
 
 for _, lsp in ipairs(servers) do
    nvim_lsp[lsp].setup {