Improve gallery

[kintel]

This may be split into multiple sub issues.
The gallery is today generated from a Json file which is cached contents generated by the Thingiverse API. This has a number of improvement possibilities:

• The cached Json file isn't updated. Set up a cron job or smth. requesting a new file regularly. We might need to move to a different hosting infrastructure for this to work.

The gallery examples are just the N latest openscad files on Thingiverse. We should collect more representative models. Ideas are:

• Create one or more collections on Thingiverse (using the openscad account), and show the contents of those collections in addition to the random selection
• Look for models from other sources than Thingiverse and create (handcode?) a similar structure for displaying those

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[kintel]

If there are too many examples, paginate the gallery (currently caps at 24)

[kintel]

Created a Gallery collection in the openscad account on Thingiverse and cached this in https://github.com/openscad/openscad.github.com/blob/master/inc/thingiverse-gallery.json