[DOC] Update the projects lists

[TonyBagnall]

draft for updating projects and including list of completed projects. WIP, I need to check people are ok with this and see about links etc

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[MatthewMiddlehurst]

Not gone through the projects md yet but made some minor changes to the papers using aeon page. main difference is replacing arxiv papers.

Be careful using headers, single # should only be used once at the top as it will add another entry to the sidebar

[MatthewMiddlehurst]

Refactored it a bit. Added the projects that did not get selected this year for GSoC. Added a previous projects page. Should last us a year 🙂