docs: streamline nav and page structure

- Separate nav items instead of single monolithic page
- Merge description.adoc content into index.adoc
- Add license section to index.adoc
- Change nav label from All to Overview

Signed-off-by: jimisola <jimisola@jimisola.com>

Author: Jimisola Laursen

docs/modules/ROOT/nav.adoc

@@ -1,5 +1,4 @@
-* xref:index.adoc[All]
-* xref:description.adoc[Description]
+* xref:index.adoc[Overview]
 * xref:installation.adoc[Installation]
 * xref:usage.adoc[Usage]
 * xref:debugging.adoc[Debugging]

docs/modules/ROOT/pages/description.adoc

@@ -1,9 +1,9 @@
 = Reqstool Java Annotations
 
-include::description.adoc[]
+This provides Java annotations and processing of annotated code.
 
-include::installation.adoc[]
+Enables the usage of `@Requirements` and `@SVCs` annotations and processors to collect, format and write annotations data to yaml files.
 
-include::usage.adoc[]
+== License
 
-include::debugging.adoc[]
+MIT License.