Update README and repo directory name

.gitlab-ci.yml

 variables:
-  RELEASE_DIR: "public/p2repo"
+  RELEASE_DIR: "public/repository"
 
 pages:
   stage: deploy

README.md

 # Indriya P2
 
-Provide version 2.1.1 of Indriya reference implementation of units of measurement (JSR-385) with dependencies as an Eclipse P2 repository.
+Provide version 2.1.3 of Indriya reference implementation of units of measurement (JSR-385) with dependencies as an Eclipse P2 repository.
 
-To add OSGi bundles published in this P2 repository add site [https://transfer.hft-stuttgart.de/pages/neqmodplus/indriya-p2/release_target_211/]() to a running Eclipse instance via `Eclipse -> Preferences -> Install/Update -> Available Software Sites -> Add...` or to a target platform definition via `Eclipse -> Preferences -> Plug-in Development -> Target Platform -> Edit...`.
+This repository is referenced from project [CityUnits](https://transfer.hft-stuttgart.de/gitlab/neqmodplus/de.hft-stuttgart.cityunits), so that the OSGi bundles published here will be added automatically to an Eclipse application that installs _CityUnits_.
+
+To manually install bundles add site [https://transfer.hft-stuttgart.de/pages/neqmodplus/indriya-p2/repository/]() to a running Eclipse instance via `Eclipse -> Preferences -> Install/Update -> Available Software Sites -> Add...` or to a target platform definition via `Eclipse -> Preferences -> Plug-in Development -> Target Platform -> Edit...`.