Metrics documentation needs to reflect PSI-MS-CV

[bittremieux]

The metrics webpage needs to be updated to the latest version, using the PSI-MS-CV rather than the outdated QC CV.

Same for the mention of CV in the introduction to mzQC.

[cbielow]

and https://hupo-psi.github.io/mzQC/use-cases/analytical-chemists/

[bittremieux]

• Introduction to mzQC – fixed in Website content updates #234
• Metrics (and subpages) – proposed in Documentation on new metrics classification #323
• mzQC format for analytical chemists