Add a commented out example of the classic complete keymaps. Fixes #866 (#868)

Attempted fix for #859, provide reasonable Debian install instructions -- comment on GitHub issue with refinement.

README.md

@@ -199,10 +199,17 @@ sudo apt install make gcc ripgrep unzip git neovim
 
 ```
 sudo apt update
-sudo apt install make gcc ripgrep unzip git
-echo "deb https://deb.debian.org/debian unstable main" | sudo tee -a /etc/apt/sources.list
-sudo apt update
-sudo apt install -t unstable neovim
+sudo apt install make gcc ripgrep unzip git curl
+
+# Now we install nvim
+curl -LO https://github.com/neovim/neovim/releases/latest/download/nvim-linux64.tar.gz
+sudo rm -rf /opt/nvim-linux64
+sudo mkdir -p /opt/nvim-linux64
+sudo chmod a+rX /opt/nvim-linux64
+sudo tar -C /opt -xzf nvim-linux64.tar.gz
+
+# make it available in /usr/local/bin, distro installs to /usr/bin
+sudo ln -sf /opt/nvim-linux64/bin/nvim /usr/local/bin/
 ```
 </details>
 <details><summary>Fedora Install Steps</summary>

init.lua

@@ -720,6 +720,12 @@ require('lazy').setup({
           --  This will expand snippets if the LSP sent a snippet.
           ['<C-y>'] = cmp.mapping.confirm { select = true },
 
+          -- If you prefer more traditional completion keymaps,
+          -- you can uncomment the following lines
+          --['<CR>'] = cmp.mapping.confirm { select = true },
+          --['<Tab>'] = cmp.mapping.select_next_item(),
+          --['<S-Tab>'] = cmp.mapping.select_prev_item(),
+
           -- Manually trigger a completion from nvim-cmp.
           --  Generally you don't need this, because nvim-cmp will display
           --  completions whenever it has completion options available.