Some minor corrections, layout change

[maltekliemann]

Most corrections (like the incorrect font in the navbar) only pertain mobile.

The main menu now contains two chapters, Documentation and Technology. This is polkadot-wiki style, and is a good solution, I believe.

I'm trying to keep pull requests small, so this isn't all of the major overhaul that was discussed on discord.

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[maltekliemann]

The color of Documentation in the menu appears to be incorrect (always blue, even if not selected). This seems to have something to do with to: /, so I expect this to get fixed with future layout changes. But it should be kept an eye on.

[maltekliemann]

Regarding the repository name: I know this is an awkward request, but maybe change the name to zeitgeist-docs or something similar?

[maltekliemann]

In light mode, navbar colors are a bit off. Most likely cause is this bug: https://github.com/facebook/docusaurus/issues/3937

[maltekliemann]

In light mode, navbar colors are a bit off. Most likely cause is this bug: facebook/docusaurus#3937

Nevermind... You can fix this problem by removing the following lines from the CSS:

.navbar {
  background: black;
  color: white;
  border-bottom: 1px solid #292830;
}

.footer {
  background: black;
  border-top: 1px solid #292830;
}

In general, if we want to have dark mode and light mode side-by-side (which I would suggest), then all style changes must be made for dark and light mode seperately using html [data-theme="dark"] { /* ... */ }.