Implemented signalling for chat, applied styling

[phazonoverload]

• Please check if the PR fulfills these requirements

• [x] You've followed the contributing guidelines

• [x] You've adheared the code of conduct

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• [ ] Bug Fix

• [x] New Feature

• [ ] Documentation Update

• [ ] Other

If bug fixes or new features

• What is the current behavior? (You can also link to an open issue here)

There is no chat

• What is the new behavior (if this is a feature change)?

A chat using signalling, provided by the Vonage Video API. Currently just shows text, not who sent it, and doesn't distinguish between the current user and others.

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

No

• Other information:

None

[phazonoverload]

This PR also changes some styling from #11 to make room for the chat