Update govuk-developers seal message

Replace the prompt to nominate a colleague for a voucher with a prompt to give a talk at tech fortnightly.

config/alphagov.yml

@@ -175,8 +175,7 @@ govuk-developers:
   quotes_days:
     - Wednesday
   quotes:
-    - "Do you know someone who has gone above and beyond? Remember you can <https://sites.google.com/a/digital.cabinet-office.gov.uk/gds/directorates-and-groups/business-and-people-services/people-services/reward-and-recognition|nominate a colleague for a voucher or bonus> at any time."
-
+    - "Have you learnt something new this week? Or would you like to improve your presentation skills on a friendly bunch of devs? Why not add a talk to the next Tech Fortnightly <https://docs.google.com/document/d/1X-AberK3K4XzXxY6N4zzKZJY5t-bXfi5YX4SAcLpYtk|agenda>."
 govuk-forms:
   channel: '#govuk-forms-tech'
   compact: true