Update key-considerations.rst

Update of key-considerations homepage text
Update timely.rst

Updated text for timely page
Update timely.rst

Fixed typo
Update comprehensive.rst

Updatd text for comprehensive key-considerations page
Update forward-looking.rst

Updated text for forward-looking key-considerations page
Update and rename well-formed.rst to structured.rst

Renamed page to "structured" + updated text
Update and rename interoperable.rst to comparable.rst

Updated text + changed name to comparable
Update structured.rst
Update and rename available-openly.rst to open.rst
Updated contents list/order
Create key-considerations-mapping.json
Update key-considerations.rst
Merge pull request #121 from IATI/SF-key-considerations

Update of key considerations