docs: render figures as SVG

[redeboer]

Matplotlib and graphviz output is currently rendered as PNG, despite this:

tensorwaves/docs/conf.py

Lines 172 to 184 in 7ad175f

	nb_render_priority = {
	"html": (
	"application/vnd.jupyter.widget-view+json",
	"application/javascript",
	"text/html",
	"image/svg+xml",
	"image/png",
	"image/jpeg",
	"text/markdown",
	"text/latex",
	"text/plain",
	)
	}

Ideal would be to set InlineBackend.figure_formats = ['svg'] by default through some IPython configuration, see e.g. https://stackoverflow.com/a/17582607/13219025 and https://ipython.readthedocs.io/en/stable/development/config.html, but I currently can't get these settings to affect Sphinx.

[codecov]

Codecov Report

Merging #243 (f8a03ff) into master (b2bb1f0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #243   +/-   ##
=======================================
  Coverage   79.31%   79.31%           
=======================================
  Files          12       12           
  Lines         585      585           
  Branches       79       79           
=======================================
  Hits          464      464           
  Misses         90       90           
  Partials       31       31           

Flag	Coverage Δ
unittests	79.31% <ø> (ø)

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