Advertise the repo.

[samcunliffe]

• [x] Create a social banner (a la matt-graham/mici
• [x] Finalise logo.
• [x] #330

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• [ ] Post on RSE Slack.
• [ ] Post on Research Programming Hub.
• [ ] CIO family teams.
• [ ] UCL collaborations hour (speaker?)
• [ ] Redirect from a nicer URL
• [ ] Print stickers
• [ ] Make poster