style: simplify rel matching
docs: public API work
feat: create new Link from parsing string slice
perf: parse Uris from string slices
fix: add proper error handling to Rel parsing
feat: add TryFrom<&str> for Rel
style: simplify rel module with macros
docs: improve public API
feat: add registered relation types
test: add very simple deserializing test
feat: add ResourceDescriptor type
feat: add Link type
feat: add Uri type
chore: initial commit