Website examples after #7520

[GuillaumeFavelier]

I inspected the website frontpage after #7520 and I noticed 3 issues:

1. Taking screenshot with time viewer is not consistent with what we had previously
   https://18971-1301584-gh.circle-artifacts.com/0/dev/auto_examples/visualization/plot_publication_figure.html#sphx-glr-auto-examples-visualization-plot-publication-figure-py

2. The titles overlap
   https://18971-1301584-gh.circle-artifacts.com/0/dev/auto_examples/inverse/plot_psf_ctf_vertices_lcmv.html#sphx-glr-auto-examples-inverse-plot-psf-ctf-vertices-lcmv-py

3. The figure is still registered after close()
   https://18971-1301584-gh.circle-artifacts.com/0/dev/auto_examples/visualization/plot_publication_figure.html#sphx-glr-auto-examples-visualization-plot-publication-figure-py

[larsoner]

Can you make a PR to fix these?

[GuillaumeFavelier]

I have something locally, I'll take care of 1) and 2)