fix(images): add favicon and brand image (backport #280)

[mergify]

This is an automatic backport of pull request #280 done by Mergify.
Cherry-pick of 4f42251 has failed:

On branch mergify/bp/v2/pr-280
Your branch is up to date with 'origin/v2'.

You are currently cherry-picking commit 4f42251.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   license-config.json
	modified:   src/app/app.css
	new file:   src/app/assets/cryostat-3-icon-16px.png
	new file:   src/app/assets/icon-cryostat-3-white.svg
	new file:   src/app/assets/icon-cryostat-3.svg
	new file:   src/app/assets/logo-cryostat-3-horizontal.svg
	new file:   src/app/assets/logo-cryostat-3.svg
	modified:   src/index.html
	modified:   webpack.common.js

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   src/app/AppLayout/AppLayout.tsx

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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