Description:
The top of page icon links don't go to the top of the page - this seems to be due to https://github.com/ral-facilities/scigateway/pull/1121, as the link instead goes to the top of the viewport and so does nothing.
A simple fix appears to be adding an id to the help page div itself and then using that in the link rather than the scigateway div currently used in the example default.json.
Description: The top of page icon links don't go to the top of the page - this seems to be due to https://github.com/ral-facilities/scigateway/pull/1121, as the link instead goes to the top of the viewport and so does nothing.
A simple fix appears to be adding an id to the help page div itself and then using that in the link rather than the scigateway div currently used in the example default.json.
Acceptance criteria: