Move to new, unified, NVIDIA sphinx theme

[JanuszL]

• moves to the NVIDIA sphinx based theme
• adds a new version switcher

Category:

Other (e.g. Documentation, Tests, Configuration)

Description:

• moves to the NVIDIA sphinx based theme
• adds a new version switcher

Additional information:

Affected modules and functionalities:

• docs

Key points relevant for the review:

• NA

Tests:

• [ ] Existing tests apply
• [ ] New tests added
  • [ ] Python tests
  • [ ] GTests
  • [ ] Benchmark
  • [ ] Other
• [x] N/A

Checklist

Documentation

• [ ] Existing documentation applies
• [x] Documentation updated
  • [ ] Docstring
  • [ ] Doxygen
  • [ ] RST
  • [ ] Jupyter
  • [x] Other
    • sphinx theme
• [ ] N/A

DALI team only

Requirements

• [ ] Implements new requirements
• [ ] Affects existing requirements
• [x] N/A

REQ IDs: N/A

JIRA TASK: N/A