create sitemap.xml for subprojects

[orbeckst]

For internal search #73 and search engine optimization it would be useful to have sitemaps.org compliant sitemap.xml files. We already automatically generate it for the jekyll site with the jekyll-sitemap plugin. We could automatically generate sitemaps for our sphinx-based content with the sphinx-sitemap plugin for sphinx.

We would then need a top-level sitemapindex.xml file that contains links to all our sitemaps; this sitemapindex.xml would be static and we can just add it to our jekyll site. The sitemap files themselves would be dynamically created (Issue #79).

We currently host (and need) sitemap files for

• jekyll site (have it already)
• MDAnalysis release docs https://www.mdanalysis.org/docs/
• User Guide (new!) https://userguide.mdanalysis.org/
• PMDA docs https://www.mdanalysis.org/pmda/
• gridDataFormats docs https://www.mdanalysis.org/GridDataFormats/
• [x] pytng https://www.mdanalysis.org/pytng/ (not active)
• [x] MDAnalysis Tutorial https://www.mdanalysis.org/MDAnalysisTutorial/ (outdated)
• [ ] SPIDAL MDAnalysis/radical.pilot tutorial https://www.mdanalysis.org/SPIDAL-MDAnalysis-Midas-tutorial/ (outdated)
• RotamerConvolveMD https://www.mdanalysis.org/RotamerConvolveMD/
• MDAnalysisData https://www.mdanalysis.org/MDAnalysisData/

[orbeckst]

These sitemaps would make all this other content discoverable to the search #73 – at the moment, none of the other subprojects (except the MDAnalysis docs) are linked from anywhere on mdanalysis.org and hence are not included in the Algolia DocSearch index.