UI: Update header
Please implement the new header layout:
- Mobile header has one hamburger in the right corner. We'll include the login options in it.
- Otherwise, the header seems to be centered (like the content)
- It seems that links to "content" are blue
- Menus open on click (and not hover)
- Login menu should open the popup below, and if logged-in, then we will use the blue links.
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