github page improvements

- [x] do we still need the "Publishing testing results" section on the Readme of the cardano-node-tests? --> remove the section
- [x] can we see the historic results of the nightly pipelines?
- [ ] create a template for the Tag Testing page
- [ ] create Issue, FR, PR templates
- [x] the links for the "Sync testing ..." + "DB revalidation testing ..." should point to [the github page](https://input-output-hk.github.io/cardano-node-tests/test_results/sync_tests.html)
- [x] explain all the statuses in the allure reports (skipped, expected failed, failed, etc)
- [ ] open all the test reports on a different page
- [ ] for the nightly test results it would be best if we would also see:
- cardano-node version, cardano-node-tests version, db-sync version
- the html report for simpler debugging
- environment name (local cluster, preview, preprod, etc)
- specific parameters (p2p, utxo-hd, cddl)
- [ ] documentation for "how to interact with an existing environment using cardano-node-test"
- [ ] add a section for "help needed" (in case somebody from the community wants to help)
- [ ] add link to "cardano environments" page
- [ ] add a link to "Grafana Dashboards" for monitoring existing public environments
- [ ] explain the system tests coverage and approach (property + feature e2e tests (positive and negative, functional and non-functional))