Check on presentations' health

[oesteban]

I'm to disable link checking for presentations in #71, as we can't let the first tree occlude the forest. Some slides do not render (e.g., https://www.nipreps.org/assets/torw2020/).

One possibility that may make things easier would be to move these to its own repo and use git modules to render them within the docs (or point at their own github-pages).

Currently, these are the supposedly failing links (most of them actually work well):

  ERROR: 15 dead links found in site/assets/ORN-Workshop/presentation/index.html !
  [✖] ../nipreps-qr.svg → Status: 400
  [✖] ../assets/narps.png → Status: 400
  [✖] ../torw2020/assets/fmriprep-ga-viewers.png → Status: 400
  [✖] ../assets/fmriprep-authors.png → Status: 400
  [✖] ../torw2020/assets/deconstructing.png → Status: 400
  [✖] ../nipreps-chart.png → Status: 400
  [✖] ../journal.pcbi.1005209.g002.png → Status: 400
  [✖] ../card-nipype.svg → Status: 400
  [✖] ../card-nibabel.svg → Status: 400
  [✖] ../card-nitransforms.svg → Status: 400
  [✖] ../card-templateflow.svg → Status: 400
  [✖] ../torw2020/assets/templateflow-archive.png → Status: 400
  [✖] ../torw2020/assets/templateflow-datatypes.png → Status: 400
  [✖] ../card-niworkflows.svg → Status: 400
  [✖] ../card-sdcflows.svg → Status: 400

  ERROR: 22 dead links found in site/assets/bhd2020/presentation/index.html !
  [✖] ../nipreps-qr.svg → Status: 400
  [✖] ../strother-2020.png → Status: 400
  [✖] ../strother-2006.png → Status: 400
  [✖] ../strother-2020-scanner.png → Status: 400
  [✖] ../narps.png → Status: 400
  [✖] ../torw2020/assets/fmriprep-ga-viewers.png → Status: 400
  [✖] ../fmriprep-authors.png → Status: 400
  [✖] ../fmriprep-workflow-final.svg → Status: 400
  [✖] ../veraart-2019.png → Status: 400
  [✖] ../wright-2019.png → Status: 400
  [✖] ../torw2020/assets/deconstructing.png → Status: 400
  [✖] ../nipreps-chart.png → Status: 400
  [✖] ../journal.pcbi.1005209.g002.png → Status: 400
  [✖] ../card-nipype.svg → Status: 400
  [✖] ../card-nibabel.svg → Status: 400
  [✖] ../card-nitransforms.svg → Status: 400
  [✖] ../card-templateflow.svg → Status: 400
  [✖] ../torw2020/assets/templateflow-archive.png → Status: 400
  [✖] ../torw2020/assets/templateflow-datatypes.png → Status: 400
  [✖] ../card-niworkflows.svg → Status: 400
  [✖] ../card-sdcflows.svg → Status: 400
  [✖] ../fmriprep-report.mov → Status: 400

  ERROR: 27 dead links found in site/assets/torw2020/presentation/index.html !
  [✖] assets/nipreps-qr.svg → Status: 400
  [✖] assets/fmriprep-commits.png → Status: 400
  [✖] assets/fmriprep-ga-viewers.png → Status: 400
  [✖] assets/fmriprep-workflow-final.svg → Status: 400
  [✖] assets/jessey.png → Status: 400
  [✖] assets/fmriprep-community-compcordocs.png → Status: 400
  [✖] assets/nmeth.png → Status: 400
  [✖] assets/natproc.png → Status: 400
  [✖] assets/deconstructing.png → Status: 400
  [✖] ../nipreps-chart.png → Status: 400
  [✖] ../journal.pcbi.1005209.g002.png → Status: 400
  [✖] ../card-nipype.svg → Status: 400
  [✖] ../card-nibabel.svg → Status: 400
  [✖] ../card-nitransforms.svg → Status: 400
  [✖] ../card-templateflow.svg → Status: 400
  [✖] assets/templateflow-archive.png → Status: 400
  [✖] assets/templateflow-datatypes.png → Status: 400
  [✖] ../card-niworkflows.svg → Status: 400
  [✖] ../card-sdcflows.svg → Status: 400
  [✖] assets/fmriprep-workflow-sdc.svg → Status: 400
  [✖] ../card-smriprep.svg → Status: 400
  [✖] ../card-dmriprep.svg → Status: 400
  [✖] ../card-fmriprep.svg → Status: 400
  [✖] ../card-mriqc.svg → Status: 400
  [✖] ../card-crowdmri.svg → Status: 400
  [✖] ../card-mriqcnets.svg → Status: 400
  [✖] assets/fmriprep-report.mov → Status: 400