ELM v3.1 updates

[shikhat-karkee-cognizone]

This PR contains remaining ELM v3.1 updates. It mainly covers:

• replacing of elm:mailbox property with elm:emailAddress property in the Ontology and all APs
• replacing of elm:Mailbox class with elm:EmailAddress class in the Ontology and all APs
• update of JSON-LD context file
  • update of emailAddress term's IRI to elm:emailAddress
  • replacing of Mailbox term with EmailAddress term
  • removal of notation term's type
• cardinality update of elm:organisation property in elm:Accreditation class across different APs
  • AMS: 1..n
  • EDC: 0..n
  • LOQ: 1..n
• cardinality update of elm:mailbox property in elm:ContactPoint class to 0..n in all APs
• typo fix in expiryDate property of Accreditation shape in EDC SHACL
• update of ontology file
  • typo fix in declaration of DisplayDetail class and displayDetail property
  • addition of missing declaration of descriptionHtml property
  • typo fix in declaration of elm:decision property
  • update of declaration of elm:image and elm:page property
  • Other typo fixes
• addition of RDF ontology documentation
• update of SHACL AP documentations
• addition of XSD AP documentations
• removal of obsolete edc-ap.json file