[tmux] Manage terminal workspaces using session naming

It's a lot easier to manage your tmux session when they have sensible names. We'll cover:

• How to create a new, named tmux session with tmux new -s
• Rename an existing tmux session using tmux rename-session -t
• Renaming sessions with C-b $
• Listing sessions with C-b s

Ctrl b + $  //renaming
Ctrl + s // list all session

Renaming session outside tmux:

tmux rename-session -t 0 web-ui

New a session with a name:

tmux new -s backend