refactor(nvim): load undotree later

perf(nvim): disable confirmation when installing plugins

style(nvim): adjust comments

perf(nvim): fast load dark magic

refactor(nvim): remove lastplace

fix(nvim): correct comment about spaces

refactor(nvim): merge to a single config file

style(nvim): remove categories

perf(nvim): lazy load most plugins

refactor(nvim): remove OpenCode plugin

refactor(nvim): use built-in undo tree

refactor(nvim): use built-in package manager

chore(nvim): update plugins

refactor(nvim): remove frecency and use combined search

refactor(nvim): remove treesitter plugin