In other words, build frontend when creating installer.
Changes to `create_installer.sh`
- If `python` is not in `PATH` but `python3` is, alias them (well, via function). This is needed on some machines to run the installer without symlinking to `python3`.
- Make the messages about pushing tags clearer. The script force-pushes, so it's possible to accidentally take destructive action. I'm not sure how to otherwise prevent damage, so I just added a warning.
- Print out `pwd` when prompting about being in the `installer` dir.
- Rebuild the frontend - if there is already a frontend build, first checks if the user wants to rebuild it.
- Checks for existence of `../build` dir before deleting - if the dir doesn't exist, the script errors and exits at this point.
- Format and spell check.
Other changes:
- Ignore `dist/` folder.
- Delete `dist/`.
**Note: you may need to use `git rm --cached invokeai/app/frontend/web/dist/` if git still wants to track `dist/`.**
