What :computer:

Create a landing page for Build section that provides an overview and links to the 101 and quickstart guides.
Moved the content from the ZKsync 101 intro into the Build Introduction page since it works really well for the landing page.
Added a couple additional entries to the glossary
Moved the Connect to ZKsync from ZKsync 101 to a top level navigation just under the new Build landing page.
- The reasoning behind this is that it provides all the information on connecting a user's wallet to the ZKsync network which should be valid for everything and not just inside ZKsync 101 section.
- This makes the link for someone to add the network to their wallet extremely quick to find.

Why :hand:

Provide a starting landing page that helps guide the reader to resources they might need at a quick glance.