UI improvements to new signin section page.
Merge pull request #1099 from code-dot-org/finished

finished -> levelbuilder
More polish.
Merge pull request #1097 from code-dot-org/signinsectionui

UI improvements to new signin section page.
Fix typo in string for section signin.
Automatically built
enable codeMirror textarea fields for artist levels
remove some more old new teacher ui stuff
Merge pull request #1101 from code-dot-org/finished

deploy to levelbuilder
Automatically built
test if I can pretend that github is a wiki
[Finishes #75723876] User agent in bug reports
Merge pull request #1102 from code-dot-org/userAgent

[Finishes #75723876] User agent in bug reports
delete users controller
Create angular-resources.md

helpful angular resources doc [skip ci]
Add ani-gif to maze loops 2
Remove custom_levels csv and json files (now using individual .level files for custom level data)
Fix issue from builder XML editor
Merge pull request #1104 from code-dot-org/level-builder

Add missing ani-gif to k1 maze loops level 2 [fixes #75556754]
Link to HTML versions of lesson plans in unplugged activities
- Add PDF download button for unplugged activities