initial landing page refresh

[matthewbcool]

Updates the landing page to reflect changes based on designs and research provided by our design team.

Old Mobile View	New Mobile View

Old Desktop View	New Desktop View

Introduces several new buttons and the SocialBar component to our component library:

Landing Buttons	SocialBar

We can test with the new images locally by making some edits to configs.js and importing the following new images:

  localDevImages = {
    logo: appLogo,
    company_logo: companyLogo,
    editor_logo: sceneEditorLogo,
    home_background: homeHeroBackground,
    landing_rooms_thumb: landingRoomsThumb,
    landing_media_thumb: landingMediaThumb,
    landing_communicate_thumb: landingCommunicateThumb
  };
}

The above images are meant to replace the images on HMC located below.

![app-logo](https://user-images.githubusercontent.com/4493657/128574127-9c95e253-dbfc-4fc4-8e05-2e5c2042e662.png)

https://uploads-prod.reticulum.io/files/7b42d52c-da14-403e-8a4f-73ddffde6070.png
home-hero-background-unbranded.jpg

https://uploads-prod.reticulum.io/files/f2784b9a-c4d7-43f0-8324-3959b14ca3fd.jpg
landing_rooms_thumb.jpg

https://uploads-prod.reticulum.io/files/6970b836-b138-40e1-8848-1ea4b9462afa.jpg
landing_media_thumb.jpg