Too deep to read: some of the plugins documents

[asnowwolf]

for example:

When I want to read the documents for spring-security-core, I have to:

1. search it from homepage
2. open http://plugins.grails.org/plugin/grails/spring-security-core from search results
3. click a link to open http://grails-plugins.github.io/grails-spring-security-core/
4. click a link to open "User Guide"
5. read it.

What I expect is:

1. there is a list of commonly used plugins
2. click a link can directly open the corresponding documents.