Remove sphinxext.opengraph

Oliver Smithrequested to merge
ollieparanoid/docs.postmarketos.org:remove-opengraph into main

This extension generates open graph preview images for sharing on social media. While this is nice in theory, this has some drawbacks:

  • Currently the preview doesn't work for pmbootstrap ("<meta property="og:image…" from the source code points to a non-existing URL, not sure why...).

  • Time for building the site and resulting file size get bigger when the extension is enabled and configured to make social graph images. Currently, when building docs.postmarketos.org with index, policies-and-processes and dpo: without opengraph: 2.6s, 2.3M with opengraph: 4.6s, 3.9M This is already an obvious difference, and it will diverge much further as we add more documentation (which we plan to do).

  • The preview images can't display SVG logos, so we currently have no logo there. It also may not be able to display some characters we use like emojis and may print additional warnings during the build.

I had only added this because it was also in the GNOME handbook, which I've used as starting point for docs.postmarketos.org. IMHO it is not worth it, so let's remove it.

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