Change nodeinfo software

[Ategon]

Requirements

• Is this a feature request? For questions or discussions use https://programming.dev/c/pangora
• Did you check to see if this issue already exists?
• Is this only a feature request? Do not put multiple feature requests in one issue.
• Is this a backend issue? Use the lemmy-ui repo for UI / frontend issues.

Is your proposal related to a problem?

The software name in nodeinfo currently says lemmy

Describe the solution you'd like.

Update to pangora

Describe alternatives you've considered.

[N/A]

Additional context

No response