chore: update flake inputs and make suggested changes

feat(lualine): disable separators

feat(precognition): init

feat(lualine): init

feat(indent-blankline): init

feat(toggleterm): init with lazygit toggle

feat(gitsigns): init

feat(lsp): init

feat(illuminate): init

feat(cmp): init

feat(oil): show hidden, change keybind

feat: add nvim-web-devicons

feat: add treesitter

feat: add zen-mode and twilight

feat: oil keymap

feat: add which-key

feat: add telescope

feat: add oil.nvim