feat(plugins)!: migrate to lazy.nvim

[snelling-a]

migrate from packer/after dir to lazy.nvim

faster starup time
plugins are (mostly) self contained modules

this is the way

• refactor(config): move user/ files to config/
• feat: init lazy
• refactor(utils): move utils and ui to lua/config
• refactor(lsp): move lsp_config to lua/config/lsp
• feat(lsp): Init lsp config
• feat(plugins): convert plugins to lazy specs
• feat(ui): feline move
• feat(explorer): nvim-tree -> neo-tree
• feat(fzf): telescope -> fzf-lua
• feat(spell): Update cspell.json