(tech.gsa.gov) Remove all the guides

[vickimcfadden]

Remove the header, and all guide content, from the site, but keep an archived version of it somewhere in case people inquire / need it later.

Only exception:

• writing effective user stories (and user stories examples PDF). And defining when a requirement is complete. I'll create a new ticket to revamp this content.

[vickimcfadden]

@jfredrickson Andrew P asked us to ⏸ on this one until he's had a chance to review them, by Monday.

[vickimcfadden]

Andrew Politi needs another week