docs: move external data sources into simple page

docs/CMakeLists.txt

@@ -5,7 +5,6 @@
 
 configure_file(mkdocs.yml ../mkdocs.yml)
 file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/appendix)
-file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/data-sources)
 
 set (DOC_SOURCES
      admin
@@ -14,7 +13,6 @@ set (DOC_SOURCES
      index.md
      extra.css
      styles.css
-     data-sources/overview.md
     )
 
 foreach (src ${DOC_SOURCES})

docs/mkdocs.yml

@@ -29,8 +29,7 @@ pages:
         - 'Postcodes' : 'develop/Postcodes.md'
         - 'Setup Test Environment' : 'develop/Setup.md'
         - 'Documentation' : 'develop/Documentation.md'
-    - 'External Data Sources':
-        - 'Overview' : 'data-sources/overview.md'
+        - 'External Data Sources': 'develop/data-sources.md'
     - 'Appendix':
         - 'Installation on CentOS 7' : 'appendix/Install-on-Centos-7.md'
         - 'Installation on CentOS 8' : 'appendix/Install-on-Centos-8.md'