Add profile menu + reorganize sidebar/header

[js0mmer]

Description

• Removes expanded sidebar from desktop
• adds profile menu on desktop in top right
  • log in button shown when not logged in
• Refactored some sidebar/header stuff
• Fixed accessibility of sidebar hamburger button and close button (use button instead of div)

nothing changed on mobile yet except a dropdown for theme

in the original issue I had sketched up a design for moving the sidebar tabs to the bottom, kind of like the mobile sites for YouTube, Twitter, or any social media site.

Screenshots

mobile

Steps to verify/test this change:

• Verify changes work as expected on staging instance

Final Checks:

• Verify successful deployment

(optional)

• Write tests
• Write documentation

Issues

Closes #312

[Awesome-E]

I think there are some improvements that could be made visually, but having this is definitely a step forward. Let's do the visual improvements in a separate PR

[github-actions]

Deployed staging instance to https://staging-421.peterportal.org