Confusing upgrade docs instructions

[pavish]

Description

• Open docs for 0.2.0: releases/0.2.0.
• Notice that the Summary says users would have to reinstall and we don't support upgrades.
• Notice that there's a section for Upgrades in the same page.
• The Upgrade section mentions that users will lose all user accounts and explorations.
  • Calling this an "Upgrade" is confusing to me.

Expectation

• Be clear on what we support reg., upgrades in the Summary.
• Do not have a title called "Upgrade", since we don't actually perform any upgrade.
  • This is the most confusing part for me.
• Perhaps rename it to: 'Recover the databases you created from previous installations'.

[seancolsen]

@pavish note that @mathemancer and I are both actively working on the upgrade instructions in #4168

[mathemancer]

Yeah, I'm not sure what to call it. From our perspective, "upgrade" isn't correct. But I think most of our users consider Mathesar to be a single unit, with the "user databases" as part of it. From that perspective, this operation is an "upgrade that loses some (meta) data", and we should manage expectations with that in mind.