Branch204 create a sort button on the home page

[gbrasier]

Looking for review and feedback so these changes can be merged into the develop branch.

• @IronGrillman and I added drop-down Callout and Sort By selectors. The logic for handling these buttons have not been implemented, that will be for a future task.
• These changes also include a toggleable order button that will be used for switching between ascending/descending order of the cards. The logic for this will be implemented in task #206, and only the scaffolding for the logic will be added in this task.
• This toggleable order button's icon changes depending on the current state of the button.

[gbrasier]

Fixed a merge conflict from task #205. Cash donate button should be above the Callout and Sort By selectors.