Update Metadata validation components documentation for 3rd prototype release

[DajanaSnopkova]

Deadline 18. 3.

Published version: https://main.soilwise-documentation.pages.dev/technical_components/metadata_validation/

Source markdowns: https://github.com/soilwise-he/SoilWise-documentation/blob/main/tech/docs/technical_components/metadata_validation.md

• use structure similar to Soil Companion component
• Move Link Liveliness Assessment to MD Augmentation
• update docs on INSPIRE metadata validation, link to Admin console for results display
• check status of Metadata completeness validation component and update docs accordingly

[DajanaSnopkova]

@pvgenuchten could you please take care of the Metadata completeness docs? I am not sure if this component is currently working after db refracturing, if it will be migrated. I planned to report the results of this validation in the Admin console (Superset Dashboard).

[DajanaSnopkova]

@MichalMed could you please update the docs on INSPIRE metadata validation? We are trying to use the same structure for all components, check out the Soil Companion, or Link Liveliness (in MD Augmentation).