feat(config): add better mapping documentation

lua/cosmic/config/mappings.lua

@@ -1,7 +1,22 @@
--- Additional remaps
+-- Add additional keymaps or disable existing ones
+-- To view maps set, use `:Telescope keymaps`
+-- or `:map`, `:map <leader>`
 
 --[[
+
+local cmd = vim.cmd
 local map = require('cosmic.utils').map
 
+-- Example: Additional insert mapping:
 map('i', 'jj', '<esc>', { noremap = true, silent = true })
-]]
+
+-- Mapping options:
+-- map('n', ...)
+-- map('v', ...)
+-- map('i', ...)
+-- map('t', ...)
+
+-- Example: Disable find files keymap
+cmd('unmap <leader>f')
+
+--]]