Merge pull request #301 from matusmarhefka/content_doc_update

Update user manual

Author: jan-cerny

doc/user_manual.adoc

@@ -76,13 +76,7 @@ system as a dependency of scap-workbench. If it isn't, install it:
 From the package repository (YUM):: # yum install scap-security-guide
 From the package repository (APT):: # apt-get install scap-security-guide
 From upstream source (for advanced users or content developers)::
- . $ git clone https://github.com/OpenSCAP/scap-security-guide.git ; cd scap-security-guide
- . $ make
-
-==== Alternative SCAP content (optional)
-[[alternative-contents]]
- * http://usgcb.nist.gov/usgcb/rhel_content.html[USGCB for RHEL5] - XCCDF and OVAL, only suitable for RHEL5.
- * https://github.com/OpenSCAP/sce-community-content[SCE Community Content] - Uses SCE, only suitable for Fedora.
+Follow instructions from https://complianceascode.readthedocs.io/en/latest/manual/developer/02_building_complianceascode.html[Building ComplianceAsCode].
 
 === Start SCAP Workbench