Scroll cards

[skgigliotti]

Description

• The search and sort bar always stays at the top of the card pane. The div CardList is now enclosed in another div called CardPane. CarList has the css property overflow: auto.
• The category List also stays fixed. The Form div for the categories is now enclosed in another div called CategoryPane. CategoryPane has the property overflow: auto.
• Mobile view for the admin page is split between the category list and the card pane to also solve the problem of keeping the search and sort bar visible.

Web View (bar now sticks at the top as cards scroll)

Mobile View

Fixes #286

Motivation and Context

The search and sort bar is always visible as the users scroll through cards in both web and mobile view.

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)

[RajChaudhry]

Thanks Sophia! I am not an expert at heavy CSS changes, so I don't feel super comfortable approving the PR by myself. If @acharliekelly and someone else can look at it, that'd be great. However, the functionality is all still here for sure. Thanks!