Nixpkgs: SideQuest is unfree, not MIT

[leo60228]

Describe the bug
The SideQuest (version 0.10.11) package is marked as MIT licensed. This is not the case for versions 0.10.5 and above, which are unfree and do not have source code available.

To Reproduce
Steps to reproduce the behavior: N/A

Expected behavior
SideQuest should be marked as unfree. In addition, it may be worthwhile to add a sidequestFree package with 0.10.4.

Screenshots
N/A

Additional context
https://old.reddit.com/r/OculusQuest/comments/gdd9dy/a_sad_update_about_sidequest_we_cannot_remain/
https://github.com/the-expanse/SideQuest/compare/v0.10.4...master

Notify maintainers
@joepie91 @rvolosatovs

Metadata
N/A

Maintainer information:

# a list of nixpkgs attributes affected by the problem
attribute: sidequest
# a list of nixos modules affected by the problem
module:

[leo60228]

relevant: #94946 (by @afreakk), #87225

[d4g]

Things have changed:
New Repo:
https://github.com/SideQuestVR/SideQuest

Announcement to OpenSource:
https://old.reddit.com/r/sidequest/comments/icmxsn/sidequest_update_with_loads_of_new_features_3/

License is MIT again. Probably the issue can be closed?