[Finishes #75065780] Add K1 Studio instructions
Hide concept videos for new courses
Flip logic
Remove unused method
Add new ani gifs
Allow instruction gifs from nested folders
Merge pull request #1025 from code-dot-org/ani_gif_folders

Allow instruction gifs from nested folders
Automatically built
Automatically built
Add test for concept <> video decoupling
Allow non-stage script levels in factory
Add survey feedback links for courses 1 & 2.
Add hole of unknown size note
Make singular [ci skip]
Merge pull request #1029 from code-dot-org/builder_unknown_hole_note

Add hole of unknown size note
Merge pull request #1024 from code-dot-org/hide_concept_videos_new_courses

Hide concept and game intro videos for non-legacy courses
Enabled testing of Stanford experiment.
Automatically built
Reverted files I didn't mean to commit.
Make script#feedback_url helper function.