🧪 TEST: Checklist for basics section and main page

[mbercx]

List of things to check for the basics section of the tutorial:

• [ ] Add a comment in the "AiiDA basics" section to mention that it is taken from the basic aiida tutorial (even if just for us to remember in the future)
• [ ] search for "this tutorial" in the section copied from the docs and replace with the appropriate section name
• [x] replace link to (missing) appendix for computer setup with a link to the aiida-core docs after aiidateam/aiida-core#4216 is merged
• [X] ~~try to find a place where to mention groups~~ - This has been moved into the "Working with data and querying section" by @chrisjsewell in #231.
• [ ] try to find a place where to show the MC provenance explorer
• [X] ~~Move Outputs subsection to "Running computations" hands on.~~ See #251
• [ ] Consider addressing #218 on pausing in basics (or running computations) section.
• [ ] See if we can wrap text in table columns to make sure tables fit the page width.
• [x] Add hands-on section for install once this is merged: https://github.com/aiidateam/aiida-core/pull/4216#pullrequestreview-443055002