Update top nav to align with #1576

[svekars]

Sync with the top nav changes in https://github.com/pytorch/pytorch.github.io/pull/1576

Local testing:

https://github.com/pytorch/pytorch_sphinx_theme/assets/5317992/30f9afcc-7236-4258-a103-2621b3c2d28d

[cjyabraham]

A few comments:

• I would make the mouse-pointer normal cursor: default; for the topnav elements with dropdown menus since they are not clickable as mentioned here
• It's a bit hard to tell from the video but I think you need to turn the titles of each page to #212529; they are looking a bit too light
• The dropdown menus seem wider and to the left of the ones I configured on this dev site but not sure if that's a problem
• Could you show the mobile menu?
• Some items on the Blog & News menu seem to have a larger top margin, like a white gap above the title
• Blog & News is missing a "Community Stories" menu item
• Could you copy the hover states for "Join" and the GH logo from this dev site?
• Was it intentional to not include the search icon?

[svekars]

• I would make the mouse-pointer normal cursor: default; for the topnav elements with dropdown menus since they are not clickable as mentioned here - ✅
• It's a bit hard to tell from the video but I think you need to turn the titles of each page to #212529; they are looking a bit too light - ✅
• The dropdown menus seem wider and to the left of the ones I configured on this dev site but not sure if that's a problem - I think the width is actually same - 300px which seems to be consistent with the changes.
• Could you show the mobile menu? - updated the video ✅
• Some items on the Blog & News menu seem to have a larger top margin, like a white gap above the title - ✅
• Blog & News is missing a "Community Stories" menu item - ✅
• Could you copy the hover states for "Join" and the GH logo from this dev site? - ✅
• Was it intentional to not include the search icon? - we have a search bar in the left nav of the sphinx doc theme.