_dataset.php: reorganise what is in accordion and not

[nathcast]

Regarding what is in the dataset page: at the moment we have first, under a simple h3

• abstract
• methods,
• table of contents.
• ...

under accordion:

• related identidiers
• funding
• licence and data access

It is suggested to change it so that we have

At the top under h3 headings (for which the size will be revisited in Issue 58)

• Abstract
• Related Identifiers
• Data access and licences

then under accordions

• Methods
• table of contents.
• ... and all the other different fields that we could have.

ToDO:

• [x] Confirm the above plan with the team
• [x] implement the plan

[nathcast]

I have made accordions where needed . Please comment

[richardostler]

I think this looks OK - closing