Replace OS-specific emoji

[paulmelnikow]

As suggested at #7129:

Use OS-independend Emojis/Unicode

Some icons such as ☙ seem to be OS-dependant since the icon has a different look on Android compared to Windows.
An OS-independend icon, either through the usage of f.e. Twemoji or by using some SVG icons could help solve this visual inconsistency.

Let's replace the use of ☙ and other emoji which render differently depending on the OS.

For process, I suggest making a quick mockup and getting a 👍 in this thread and then we can sort out the technical aspects (like checking in svg vs separate CDN vs npm) in a PR.

[aditya1abhinav]

Hi @paulmelnikow I would like to work on this issue

[vikasjainn]

👍 I'm ready

[chris48s]

We have just launched a completely redesigned frontend https://shields.io/

Closing this issue as it relates to the previous frontend. These characters are no longer present