Address some layout issues with odd content spacing on mobile, and footer position (#3022)

* - set vars for player container height and status bar height
- use them to calculate mobile top spacing to adjust for tab content positioning

* give main content section a min height, place footer absolutely at bottom; rm all the fixed footer styling

* cleanup; restructure tabbed display logic and css a bit

* Prettified Code!

* cleanup

* fix(story): footer story needs to be wrapped in RecoilRoot if it is to use Recoil

* revert adding footer to mobile about section

* prevent double scrolling

---------

Co-authored-by: gingervitis <gingervitis@users.noreply.github.com>
Co-authored-by: Gabe Kangas <gabek@real-ity.com>

web/components/ui/Footer/Footer.stories.tsx

@@ -1,5 +1,6 @@
 import React from 'react';
 import { ComponentStory, ComponentMeta } from '@storybook/react';
+import { RecoilRoot } from 'recoil';
 import { Footer } from './Footer';
 
 export default {
@@ -8,7 +9,11 @@ export default {
   parameters: {},
 } as ComponentMeta<typeof Footer>;
 
-const Template: ComponentStory<typeof Footer> = args => <Footer {...args} />;
+const Template: ComponentStory<typeof Footer> = args => (
+  <RecoilRoot>
+    <Footer {...args} />
+  </RecoilRoot>
+);
 
 // eslint-disable-next-line @typescript-eslint/no-unused-vars
 export const Example = Template.bind({});