Activate Pythagoras Mithril era

[jpraynaud]

Why

The support code for the Pythagoras Mithril era has been added in #1946. The era switch needs to be executed once the threshold of 95% of compatible signer nodes is reached (running a version >= 0.2.200).

What

Activate the Pythagoras era on the public Mithril networks and then remove the previous Thales epoch.

How

• Add a one line install script for the Mithril nodes
  • Implement script
  • Use it in documentation one pre-built binaires installs
  • Add dev blog post
  • Announce on Discord
• Create dev blog post
• Prepare a rollout plan for the new Pythagoras era in the public Mithril networks:
  • pre-release-preview
    • create era switch transaction
    • announce era switch is scheduled on Discord
    • verify that era switch has completed
    • Update dev blog post
  • release-preprod
    • create era switch transaction
    • announce era switch is scheduled on Discord
    • verify that era switch has completed
    • announce era switch has completed on Discord
    • Update dev blog post
  • release-mainnet
    • create era switch transaction
    • announce era switch is scheduled on Discord
    • verify that era switch has completed
    • announce era switch has completed on Discord
    • Update dev blog post
• Once the Pythagoras is activated in the public Mithril networks:
  • Activate the new era on the testing-sanchonet network
    • create era switch transaction
    • announce era switch is scheduled on Discord
    • verify that era switch has completed
    • announce era switch has completed on Discord
  • Cleanup the Thales era in the code