Supported logos:
- appveyor
- azuredevops
- bitcoin
- circleci
- codeship
- dependabot
- discord
- docker
- eclipse
- github
- gitlab
- gitter-white
- lgtm
- liberapay
- matrix
- npm
- paypal
- postgresql
- scrutinizer
- serverfault
- slack
- sourcegraph
- stackexchange
- stackoverflow
- superuser
- telegram
- tfs
- travis
- windows
Or any of the ones from simple-icons.
Alternatively: start with one of:
data:image/svg+xml;base64,<base64-endoced svg>data:image/png;base64,<base64-endoced png>
b64.io can be used to encode the images (PNG, SVG, ...).
Then, URL-encode it (e.g., here).
Works best when the encoded data is small.