M3 documentation

[gtmx23]

• Added reflections for m3 - please do review them and add anything I missed out/edit anything that is wrong
• Removed ../ in data.py
• Added descriptions for project, name and dataset
• Changed last updated date

Will be working on the drop down thing but thought I should create a PR for this working thing while I have it! Closes #95 and #67

New changes

• Added the collapsible section, YAY!
• Updated reflection section to reflect changes - addition of card (already done), implementation of collapsible information section

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