Major config changes

Add alacritty config, as it is my main terminal now
Change **a lot** of nvim configs
Add tmux configuration
Update zsh configs
Add .gitconfig with custom pager
Include tmux-plugin-manager as a submodule

.config/nvim/lua/config/plugins/nvim-tree.lua

@@ -1,3 +1,6 @@
 vim.g.loaded_netrw = 1
 vim.g.loaded_netrwPlugin = 1
+
 require("nvim-tree").setup()
+
+vim.keymap.set('n', '<C-b>', ':NvimTreeToggle<CR>')