Stop using lazy for plugins: separate install (nix!) and load

[bew]

I already moved to a kind of custom system to declare plugins, that uses Lazy as a backend.

But want to move to https://github.com/nvim-neorocks/lz.n for loading plugins, and Nix-based install/make-available of plugins.

TODO: impl not clear exactly..

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Old issue (before @2024-09-27)

vim & neovim now natively supports packages of plugins: https://neovim.io/doc/user/repeat.html#packages

This seems to allow faster plugin loading on startup and simpler/cleaner (how so? native-to-vim?) plugin handling (instead of only relying on runtimepath mutations).

The idea of pack based plugin managers is that the manager is a vim pack, which manages a bunch of plugins

vim-packager

https://github.com/kristijanhusak/vim-packager

minpac

https://github.com/k-takata/minpac

motivation: justinmk moved to it! and it claims to be faster https://www.reddit.com/r/neovim/comments/d4rdc0/what_new_configurations_have_you_added_in_your/f0ggn6t/

Plugpac: as thin wrapper around minpac to have a near vim-plug experience: https://github.com/bennyyip/plugpac.vim (what about compatibility of

[bew]

Actually it doesn't look that much faster from this benchmark from vim-plug author: https://github.com/junegunn/vim-startuptime-benchmark

Using more lazyness in vim-plug could be enough to reduce startup times..

Also I need to profile my startup time to avoid useless optimizations