adapt the install section

README.md

 # vl-dcc
 DCC generation for the vacumm laboratory.
 
+## install & activate
+
+Create a file `.git/hooks/pre-push` in the GIT repository with the following 
+content:
+
+```shell
+#!/bin/bash
+
+# In the case of "git push --tags", writes the short tag value to the 
+# VERSION file in the top level directory of the Git repository
+
+toplevel=$(git rev-parse --show-toplevel)
+f=${toplevel}/VERSION
+touch $f
+old_version=$(cat $f)
+new_version=$(git describe --tags --abbrev=0)
+
+if [ "$old_version" != "$new_version" ]; then
+  echo "$new_version" > $f
+  git commit -am "update version to '"$new_version"'"
+  git push origin # Is required because normal push does not necessarily happen
+fi
+
+exit 0
+```
+
+Then make this file executable:
+
+```shell
+chmod 755 .git/hooks/pre-push
+```
+
+Do the following steps with root permission on the server installation:
+
+```shell
+mkdir -p /usr/local/share/vl-dcc
+cd /usr/local/share/vl-dcc
+curl --silent --output - \
+  https://gitlab1.ptb.de/niepra01/vl-dcc/-/archive/master/vl-dcc-master.tar \
+  | tar xf - --strip-components=1           # only once
+python3 -m venv .
+source bin/activate
+pip3 install pip-tools
+pip-compile
+chown -R nobody.nobody ../vl-dcc
+systemctl daemon-reload                     # if already exist
+systemctl link $PWD/vl-dcc.service
+systemctl enable vl-dcc.service             # make permanent
+systemctl start vl-dcc.service      
+systemctl status vl-dcc.service             # running?
+journalctl -f --unit vl-dcc.service         # run-time check
+```
+
 ## api
 
 ### vl-dcc/<cer_doc_id> (GET)
@@ -56,34 +109,6 @@ via the requested tar stream:
 ```    
 curl -s http://localhost:5006/version
 ```
-    
-## init & run server
-
-```
-./server
-```
-    
-## install & activate
-
-Do the following with root permission:
-
-```bash
-mkdir -p /usr/local/share/vl-dcc
-cd /usr/local/share/vl-dcc
-curl --insecure --silent --output - \
-  https://a75436.berlin.ptb.de/vaclab/vl-dcc/-/archive/master/vl-dcc-master.tar \
-  | tar xf - --strip-components 1    # only once
-python3 -m venv .                    # only once
-source bin/activate                  # only once
-pip3 install pip-tools               # only once
-pip-compile                          # only once
-chown -R nobody.nobody ../vl-dcc 
-systemctl daemon-reload              # if already exist
-systemctl link $PWD/vl-dcc.service   # make permanent
-systemctl restart vl-dcc.service
-systemctl status vl-dcc.service      # running?
-journalctl -f --unit vl-dcc.service  # run-time check
-```
 
 ## More hints