docs: Replace HireUsSection with @swmansion/t-rex-ui component

[patrycjakalinska]

This PR bumps @swmansion/t-rex-ui to 0.0.13

With new release of @swmansion/t-rex-ui we can replace HireUsSection with reusable component. Additionally, there were changes to definition of HireUs button in TOC, but the desired outcome is - after update it should stay the same.

Section:

TOC:

Test plan

1. In docs-reanimated run yarn && yarn start
2. Check HireUsSection on landing in dark and light mode, check the link - the link should have correct source
3. Do the same to HireUs banner in docs' TOC