Fedora Design Team Docs: Revamp Requests section

As part of &13 we are revamping https://docs.fedoraproject.org/en-US/design/ to include more information and make it look more inviting 😃 taking inspiration from our old Wiki page: https://fedoraproject.org/wiki/Design. We are going to break it down into sections and work on one part at a time.

Tickets for other sections can be found in the Fedora Team Resources epic: &13

For this ticket, we need to have what our Requests section will say. This just needs to be a text draft for now.

Some points and subheadings to include:

Requests

Request templates

• How to fill out the issue template
• Details that need to be included when making a request

Lead time for requests

• How much lead time to give & why we need it