Create an "onionspray announce" tag in the Forum

Description

Right now the onionspray tag is being used for announcing new releases.

This is sub-optimal since the same tag may be used for general support questions, thus generating noise for people only interested in notifications about new releases.

Tasks

• Create the onionspray-announce tag.
• Update the documentation:
  • Adding development information for this tag.
  • Recommending users to subscribe to this new tag.
  • Adding the onionspray tag in the contact information.
• Update the Onion Support workflow improvements ticket with this new information.

Time estimation

• Complexity: negligible (0.1 day)
• Uncertainty: low (x1.1)
• Reference (adapted)