Fixes function searching and jumping

[Spoffy]

This PR:

• Reworks how function names are rendered on the functions page, meaning we don't need a hidden header element.
• Adds attr_list as an extension (I think it should always have been there?)
• Adds styling to make the (now visible) header elements match what was there before.
• Fixes sections not expanding when jumped to via permalink or searching

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[dsagal]

Thank you @Spoffy ! There is another piece of behavior that seems to need fixing: when clicking on a link to go to a function, we used to have a bit of JS that expands that function (since normally all are collapsed). It is in expandSelected() in help/en/docs/js/grist.js.

[Spoffy]

Thank you @Spoffy ! There is another piece of behavior that seems to need fixing: when clicking on a link to go to a function, we used to have a bit of JS that expands that function (since normally all are collapsed). It is in expandSelected() in help/en/docs/js/grist.js.

Thanks for pointing me at the right file - this should be all sorted now too!