Install doxygen-awesome

[nahueespinosa]

Proposed changes

Installs and configures https://jothepro.github.io/doxygen-awesome-css/.
This modern theme updates the visuals of Doxygen without changing its overall layout too much.

Type of change

• 🐛 Bugfix (change which fixes an issue)
• 🚀 Feature (change which adds functionality)
• 📚 Documentation (change which fixes or extends documentation)

Checklist

• Lint and unit tests (if any) pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• All commmits have been signed for DCO

Additional comments

Here is the output of the documentation build step: docs.zip

[nahueespinosa]

Before:

After:

[ivanpauno]

LGTM!