Update Favicons and Associated HTML Code

[aaronskiba]

Changes proposed in this PR:

• Update favicons to and associated html code

  • Favicon and HTML code generated via https://realfavicongenerator.net/

  • The previous favicon was also generated via https://realfavicongenerator.net/. (https://github.com/portagenetwork/roadmap/commit/d646920180da2642890b766b50e8ba5781ded179) However, rather than public/android-chrome-192x192.png and public/android-chrome-256x256.png, this time only public/android-chrome-144x144.png was generated. The updated public/site.webmanifest reflects this change.

Also, due to the size of the provided favicon, https://realfavicongenerator.net/ outputted the following warning:

The strict minimum for the master picture is 70x70. Your picture is 150x150, which is ok. However, it is recommended to use a picture of at least 260x260. If you still want to use your picture, some of the derivated favicons will not be generated, such as the high resolution tile for Windows 8 / IE 11.

[aaronskiba]

Closing this PR and will re-open with a cleaner branch. I thought tests were failing due to new favicons, but the issue ended up being resolved via the following PR: https://github.com/portagenetwork/roadmap/pull/871