Update benchmarks library with yaml file fragment for repro-collection
mysql workload. It defines the suite, name, & type of the benchmark.
Benchmark container image is already saved in gitlab registry.
This image path is specified in the yaml file.

Other params for repro-collection benchmark include:
- workload which is currently `mysql`
- sut_nr_cpus fixed at 16 to test workload correctly

Update Ubuntu license info along with Debian.
Docker image for repro-collection benchmark uses Ubuntu:22.04.

Signed-off-by: Aishwarya Rambhadran <aishwarya.rambhadran@arm.com>

Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>

Adding all boilerplate for Sphinx (and soon ReadTheDocs) to be able to
build the documentation, as well as a skelleton set of pages; index,
license, etc.

This is mostly copied over from Shrinkwrap.

Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>