Add new giti features

[nazmulidris]

The following need to be turned into sub-issues:

• giti diff <option> -> similar to diffnav but with real-time UI refresh when files change locally; currently i use diff-so-fancy (perl script)
• giti show <name> -> choose an older version of a file to checkout to Downloads and optionally view in the editor_component itself in a TUI applet
• git rebase -i -X theirs <origin/main> -> rebase current branch with <origin/main> and for conflicts use the files in <origin/main>.
• giti branch rename -> rename an existing branch to other
• giti develop * -> choose issues using TUI app as part of the flow
• giti commit
• giti delete * -> switch to main and pull (delete remotes)
• giti --manual -> show the user guide for giti using the TUI MD component w/ search, jump to headings, etc
• In the final screen, make sure to add horiz divider lines (like in log output) to separate the different sections of the output
• giti worktree/workspace -> list, create, delete, switch git worktrees
• giti branch rename -> rename an existing branch to other
• giti show <name> -> choose an older version of a file to checkout to Downloads and optionally view in the editor_component itself in a TUI applet
• giti develop * -> choose issues using TUI app as part of the flow
• giti commit
• giti delete * -> switch to main and pull (delete remotes)
• giti --manual -> show the user guide for giti using the TUI MD component w/ search, jump to headings, etc