Add features to store descriptions

[andylolz]

I think this is roughly the list of features, currently:

• Visualise all org-level budget data – either total, or filtered by recipient country, recipient region, or recipient organisation. Additionally, filter by budget line
• Visualise org-level expenditure data, and filter by expense line
• Export filtered budget or expenditure data to Excel
• Search and filter documents

[andylolz]

Done.