Update content.json

* moved video for Remix up one blob.
Merge pull request #954 from keyboardkat/patch-21

Fixes Bug 1058342 - Add more resources to Web Literacy: Remixing page
bug1059439: app gallery doesn't display properly
Merge pull request #956 from errietta/bug1059439

bug1059439: app gallery doesn't display properly
1.1.52
Fixed Bug 1022636

Link /Tools header areas to tools urls
Merge pull request #958 from tanay1337/master

Fixes Bug 1022636 - Link /Tools header areas to tools urls
 Bug 1038390 - Make Your Own Make-Masonry
 Bug 1059425 - "Make Your Own" makes should use new make directive