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/options.lua

@@ -27,5 +27,8 @@ vim.o.timeoutlen = 300
 -- Set completeopt to have a better completion experience
 vim.o.completeopt = 'menuone,noselect'
 
--- NOTE: You should make sure your terminal supports this
+-- Enable TrueColor
 vim.o.termguicolors = true
+
+vim.o.splitbelow = true
+vim.o.splitright = true