Template content updates

[rmbielby]

Dashboard

• Downloads: need to have some explicit text around whether the download is the whole dataset or a subset based on the user input. Also a rough estimate of the size of the file to be downloaded.

Support and feedback

• The find out more section should have some text explicitly saying teams should link directly to their publication here (in addition to linking to the EES homepage). Could also add in a link to the home of DfE Stats on gov.uk.

[cjrace]

Suspect the second half of this is already covered in dfeshiny, though we should check the template and update around the file download to show an estimate of size and explain what selection of data it provides

[rmbielby]

And this first half looks like it's covered by issue #122 as well, which is on the way to being closed off by #129