📓 README: Reference howto/*proxy*.md instead of duplicating the proxy settings

README.md

@@ -72,9 +72,6 @@ This produces a workspace directory `PPN77164308X` with the OCR results in it;
 the results are viewable as explained above.
 
 ppn2ocr requires a working Docker setup and properly set up environment
-variables for the proxy configuration. At SBB, this means:
+variables for the proxy configuration. At SBB, this following
-~~~
+`howto/docker-proxy.md` and `howto/proxy-settings-for-shell+python.md`
-export HTTP_PROXY=http://http-proxy.sbb.spk-berlin.de:3128/
+(in qurator's mono-repo).
-export HTTPS_PROXY=$HTTP_PROXY; export http_proxy=$HTTP_PROXY; export https_proxy=$HTTP_PROXY
-export no_proxy=localhost,digital.staatsbibliothek-berlin.de,content.staatsbibliothek-berlin.de
-~~~