Move resources under src/main

Having the resources in the wrong place caused the plugin to
not expose any documentation entry.

Change-Id: I7dc55698090518c6fadee75c0a834e71fc1e9021

src/main/resources/Documentation/config.md

diff --git a/src/resources/Documentation/config.md b/src/main/resources/Documentation/config.md
similarity index 100%
rename from src/resources/Documentation/config.md
rename to src/main/resources/Documentation/config.md