Showcase sites update

[philwareham]

NTS: Refresh the showcases section and add new/update existing/remove obsolete sites.

To remove:

• nwlatournament
• designbyaltitude
• artandculturecenter
• hicksdesign (https://twitter.com/Hicksdesign/status/1305945104285401088)

To add:

• proximowebdesign
• TBC
• TBC

To refresh:

• hicksdesign