Update README with new features, and other small fixes

[hello-amal]

Description

This PR makes a few changes to bring the codebase up-to-date with the recent forum post "Exciting New Features for the Stretch Web Interface!"

1. It updates the README with additional GIFs of the new features, and a few of old features that weren't in the README.
2. It makes slight changes to the CSS and functionality of Movement Recorder, to account for two issues:
   1. On a 13" laptop, the Joint Selection Modal doesn't show all the joints (see screenshot below); this PR increases its height.
   2. If the user cancels joint selection, the button still says "save," not "record."
3. It updates the configure_audio.sh script to also set other relevant audio devices (starting from and improving upon the change in #91 ).

Testing procedure

• [x] Run ./configure_audio.sh, verify it works and doesn't log any errors.
  • [x] Tested on 3012 and a standalone NUC.
• [x] Run Movement Recorder on a 13" laptop:
  • [x] Verify the issue (see screenshot below).
  • [x] Verify the fix (see screenshot below).
• [x] Go through the new additions to the README, verify they showcase the new features well.

Before opening a pull request

From the top-level of this repository, run:

• [x] pre-commit run --all-files

To merge

• [ ] Squash & Merge