consider moving initialisation to lua

[matu3ba]

I like the plugin very much. Thanks alot for creating!

Reasons to do:

1. A pure lua profile would decrease startup time.
2. The lua startup profiler would be more correct or simpler to get correct with this change. Otherwise one gets more wrong results.
3. Try to be consistent as to use functionality of lua, if possible.
4. Having a function to initialize makes separating things for user-specific settings while getting updates much easier (user may implement a different function to customize plugin).

Another related reason (bad practice/historical reasons): nvim-treesitter/module-template#1

Relevant content for change:
https://github.com/nanotee/nvim-lua-guide#using-meta-accessors-1

[matu3ba]

sorry, this is a treesitter template issue/bug. will reopen, once that is fixed in the template.