Additional GPP-382 and GPP-383 Changes

[johnyu95]

Additional 508 changes based on Walei and Arthur's latest feedback

Changes made:

• Switched position of "Limit your search" heading and button to expand filters (this is intended for mobile view of page).
• Changed label of button to expand filters from "Toggle Facets" to "Filters".
• Changed focus outline for homepage link, language picker, and login button to white for better visibility.
• Changed color of "Go" button for better visibility with the focus outline.
• Changed "More Options" button into just a link styled as a button instead of a link inside of a button. This is to remove extra tabbing after focus is already on the button.
• Removed tabindex attribute from skip to link to remove extra tabbing and removed name attribute because it is deprecated.