Import two examples from the plotlyjs-julia website

[mzaffalon]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.72%. Comparing base (40caf9c) to head (a64bbc6).
⚠️ Report is 19 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #523       +/-   ##
===========================================
+ Coverage   28.67%   50.72%   +22.04%     
===========================================
  Files           8        8               
  Lines         265      276       +11     
===========================================
+ Hits           76      140       +64     
+ Misses        189      136       -53     

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[mzaffalon]

The scattergl example in line-and-scatter.md generates a large SVG file.

[jd-foster]

CI error is

┌ Error: Generated HTML over size_threshold limit: extra-examples/line-and-scatter.md
│     Generated file size: 1.08 (MiB)
│     size_threshold_warn: 400.0 (KiB)
│     size_threshold:      1.0 (MiB)
│     HTML file:           extra-examples/line-and-scatter/index.html
└ @ Documenter.HTMLWriter ~/.julia/packages/Documenter/AXNMp/src/html/HTMLWriter.jl:2000
┌ Warning: For 1 @example blocks, the 'text/html' representation of the resulting
│ object is above the threshold (example_size_threshold: 1048576 bytes).
│ - 1 blocks had 'image/svg+xml' fallback image representation available, using that.
│   On pages: extra-examples/line-and-scatter.md
└ @ Documenter.HTMLWriter ~/.julia/packages/Documenter/AXNMp/src/html/HTMLWriter.jl:915

We could definitely reduce size of the last example in line-and-scatter.md by changing the number of points from 100_000 to something much smaller (or just cut that example).

[jd-foster]

Now I look at the documentation repository, there is no licence provided, open-source or otherwise.

[mzaffalon]

Instead of forcing the update of the remote branch I closed it. PR with the fix is now #524.

Regarding the licence: no licence means we cannot use the material without permission. Would you @jd-foster like to ask them?

[jd-foster]

Actually I see now that the website repo for hosting the plotly docs has a CC licence:
https://github.com/plotly/graphing-library-docs/blob/master/LICENSE