Objective 2, Activity 5: POC for Human-memorable addresses for .onion services

This is the parent ticket to hold any tickets under this activity, including:

• Evaluating using HTTPS-Everywhere.
• Evaluating using HTTPS-Everywhere’s Update Channels feature to add custom onion rulesets that can be updated automatically.
• Evaluating adding a designated file extension handler in Tor Browser to handle HTTPS-Everywhere rulesets.
• Evaluating enhancing the UI of HTTPS-Everywhere so that it educates users on how onion update channels work.