Replace "add a system manually" route with a page to select from connectors

[allisonking]

Is your feature request related to a specific problem?

Instead of going through a long form when creating a system, we should instead have a list of potential systems to connect to which the user can choose from.

Describe the solution you'd like

Let's use the systems we have connectors for and render a page where the user can click on a connector/system and then are brought to a page where they can provide more information about their system.

To keep the ticket/PR small, this ticket is just about:

• navigating to the new page
• rendering the systems/connectors
• the search bar
• routing to another page to fill in info for the system once a tile is clicked

We'll do the work of filling in the system info in a separate ticket. It's possible we can reuse a lot from the existing connectors page.

Describe alternatives you've considered, if any

A description of any alternative solutions or features you've considered.

Additional context

Design: https://www.figma.com/file/dmEwdK3xZwjKfGVQ9t66xe/Fides-v.2-Master-Working-Files?node-id=2781%3A98635&t=F020IMrWRAfmtPLN-0

[allisonking]

This will also need to cover the new "add systems" page redesign:

https://www.figma.com/file/dmEwdK3xZwjKfGVQ9t66xe/Fides-v.2-Master-Working-Files?node-id=3116%3A111644&t=OJLKzhwa0v9vsopx-0