Add design document for web app sharing

Funding acknowledgement update (#357)

docs(diagrams): add code flow clarification maps

add: receiver side diagrams

add: receiver side diagrams

add(ocm-api): introduce new diagrams for code flow and share creation processes

fix(ocm-api): tighten decision table prose

add(ocm-api): add code flow decision table

fix(ocm-api): clarify share token flow

fix(ocm-api): clarify discovery token roles

docs(notifications): add notifications research

Drop legacy ocm-provider discovery endpoint

Add gitignore

Clearify copyright status of specification for DFSG compatibility.

Added link to the original blog post, credits to Frank and Bjoern