#1201 update mkdocs plugin

Author: lojzatran

gradle-scripts/mkdocs.gradle

@@ -1,6 +1,6 @@
 mkdocs {
     // mkdocs sources
-    sourcesDir = 'src/docs' // default is 'doc' in the root directory.
+    sourcesDir = 'docs' // default is 'doc' in the root directory.
     // strict build (fail on build errors)
     strict = true
     // target build directory (publication root)