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Add error display for studio curator and project adder inputs

Show "students projects" filter on studio project browser

Bug fixes from studio playground test on May 12

Merge pull request #5408 from LLK/dependabot/npm_and_yarn/scratch-gui-0.1.0-prerelease.20210514040957

Bumps [scratch-gui](https://github.com/LLK/scratch-gui) from 0.1.0-prerelease.20210513040305 to 0.1.0-prerelease.20210514040957.
- [Release notes](https://github.com/LLK/scratch-gui/releases)
- [Commits](https://github.com/LLK/scratch-gui/compare/0.1.0-prerelease.20210513040305...0.1.0-prerelease.20210514040957)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [scratch-l10n](https://github.com/LLK/scratch-l10n) from 3.11.20210513031505 to 3.11.20210514031523.
- [Release notes](https://github.com/LLK/scratch-l10n/releases)
- [Commits](https://github.com/LLK/scratch-l10n/compare/3.11.20210513031505...3.11.20210514031523)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Fixup header styling

Outlines for avatars

Studio open toggle

[Develop] Release 2021-05-12

Fixed problem introduced by previous fix

fix logic for when to show intro to users

Merge pull request #5395 from LLK/dependabot/npm_and_yarn/scratch-gui-0.1.0-prerelease.20210513040305

Bumps [scratch-gui](https://github.com/LLK/scratch-gui) from 0.1.0-prerelease.20210512144423 to 0.1.0-prerelease.20210513040305.
- [Release notes](https://github.com/LLK/scratch-gui/releases)
- [Commits](https://github.com/LLK/scratch-gui/compare/0.1.0-prerelease.20210512144423...0.1.0-prerelease.20210513040305)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [scratch-l10n](https://github.com/LLK/scratch-l10n) from 3.11.20210512031514 to 3.11.20210513031505.
- [Release notes](https://github.com/LLK/scratch-l10n/releases)
- [Commits](https://github.com/LLK/scratch-l10n/compare/3.11.20210512031514...3.11.20210513031505)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Fixes to Developers' Page