github: customize pull request template for documentation

.github/.github/pull_request_template.md

@@ -0,0 +1,23 @@
+:heart: Thank you for your contribution!
+
+### Description
+
+> Please describe briefly your pull request.
+
+
+
+### Checklist
+
+Ticks in all boxes and 🟢 on all GitHub actions status checks are required to merge:
+
+- [ ] I'm aware of the [code of conduct](https://inveniordm.docs.cern.ch/contribute/code-of-conduct/).
+- [ ] I've created [logical separate commits](https://inveniordm.docs.cern.ch/develop/best-practices/commits/#commits) and followed the [commit message format](https://inveniordm.docs.cern.ch/develop/best-practices/commits/#commit-message).
+- [ ] I've targeted the `master` branch.
+- [ ] If this documentation change impacts the current release of InvenioRDM, I will backport it to the `production` branch following approval or indicate to a maintainer that it should be backported.
+
+**Reminder**
+
+By using GitHub, you have already agreed to the [GitHub’s Terms of Service](https://help.github.com/articles/github-terms-of-service/#6-contributions-under-repository-license) including that:
+
+1. You license your contribution under the same terms as the current repository’s license.
+2. You agree that you have the right to license your contribution under the current repository’s license.

README.md

@@ -2,7 +2,7 @@
 
 ## About
 
-InvenioRDM user documentation web site.
+This is the source of InvenioRDM user documentation web site. You can view the documentation for the current release of InvenioRDM at [https://inveniordm.docs.cern.ch/]( https://inveniordm.docs.cern.ch/), which tracks the `production` branch of this repository. You can see the documentation for the in-development next version of InvenioRDM at [https://inveniordm-dev.docs.cern.ch/](https://inveniordm-dev.docs.cern.ch/), which tracks the `master` branch of this repository.
 
 ## Running