chore: doc, test, lint, ci (#96)

* lint: relinted the code base
* doc: updated docs (aligned with other go-openapi repos)
* doc: relinted markdown & godoc
* doc: fixed discord link
* test: upgraded tests to use generics
* ci: updated workflows, removed local git-cliff config

Signed-off-by: Frederic BIDON <fredbi@yahoo.com>

Author: fredbi