[tmux] Drop C-t keybind `last-pane or last-window or new-window`

last-pane || tmux last-window || tmux new-window
[tmux] Drop i keybind `display-panes`
[tmux] Drop meaningless lines.
[tmux] Change order of file. Fix style.
[tmux] Drop selecting page keybinds `h/j/k/l`
[tmux] Fix styling
[tmux] fix style
[bash] Remove meaningless lines in bashrc.
[gitignore] Group
[tig] Group
[tig] Bind last-line to G in main-mode