Add semi-annual reports to the documents page

One-sentence description

Desired behaviour

Have it show for each year. The document is currently buried in the GM's. Easy to do since it can be an annual document category. The documents page has also been restyled, adding it as another card shouldn't be a problem.

Suggested implementation

Add a model for Semi-annual reports
Add a document card to the documents tab for each year for those reports
Change the accordion size to col-md-4 so that this card can fit

Edited Feb 16, 2019 by Sébastiaan Versteeg

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