Add the new doc pages to the site index (#852)

docs/Plugins/PMD.md

@@ -17,6 +17,7 @@ PMD is a source code analyzer that searches for common programming flaws.
 It supports many different languages and can be extended by different sets of rules.
 
 In its current implementation the plugin uses the following sets of rules:
+
  - all-java.xml ([link](https://github.com/pmd/pmd/blob/83522e96ef512f2b9a41586ae239509ec6f8313f/pmd-core/src/main/resources/rulesets/internal/all-java.xml))
 
 !!! note
@@ -26,4 +27,4 @@ In its current implementation the plugin uses the following sets of rules:
 
 !!! question "How does PMD use the context?"
 
-    PMD does not rely on addition context, this option is therefore ignored.
+    PMD does not rely on additional context, this option is therefore ignored.

mkdocs.yml

@@ -162,6 +162,10 @@ nav:
         - 'What is Coko?': Coko/index.md
         - 'Modelling APIs with Coko': Coko/modelling.md
         - 'Coko Rules': Coko/rules.md
+    - 'Use Analysis Plugins':
+        - 'Overview': Plugins/index.md
+        - 'PMD Plugin': Plugins/PMD.md
+        - 'FindSecBugs Plugin': Plugins/FindSecBugs.md
     - 'Contributing':
         - 'Contributing to Codyze': contributors/index.md
         - 'Building the project': contributors/code.md