Reorganizing navigation for "Contributors guide" component (#109)

* Reorganizing navigation for component

* Removing obsolete files

Author: yaningo

docs/contributors/modules/ROOT/nav.adoc

@@ -1,14 +1,13 @@
-* xref:docs-style:index.adoc[Docs style guide]
-** xref:docs-style:style-guide-overview.adoc[Style guide overview]
+* Docs style guide
 ** xref:docs-style:formatting.adoc[Formatting]
 ** xref:docs-style:style-and-voice.adoc[Style and voice]
 ** xref:docs-style:headings.adoc[Headings]
 ** xref:docs-style:using-lists.adoc[Using lists]
-** xref:docs-style:links.adoc[Cross references and lists]
+** xref:docs-style:links.adoc[Cross references and links]
 ** xref:docs-style:using-images.adoc[Using images]
-** xref:docs-style:using-tables.adoc[Tables]
+** xref:docs-style:using-tables.adoc[Using tables]
 ** xref:docs-style:using-code-samples.adoc[Using code samples]
-* xref:templates:index.adoc[Content templates]
+* Content templates
 ** xref:templates:template-conceptual.adoc[Template for a conceptual page]
 ** xref:templates:template-how-to.adoc[Template for a how-to page]
 ** xref:templates:template-tutorial.adoc[Template for a tutorial page]

docs/contributors/modules/ROOT/pages/index.adoc

@@ -2,3 +2,7 @@
 :page-description: An overview of contributing to CircleCI docs including page templates and our style guide.
 :icons: font
 :experimental:
+
+This guide is a reference for contributors to CircleCI docs. Our style guide evolves so you will probably find older documentation does not meet the requirements set out here. Use this guide to help you write new docs, and when working on existing documentation it would be great if you can make edits to help keep everything consistent.
+
+For further information on markdown and asciidoc syntax refer to the https://github.github.com/gfm/[markdown documentation] and https://asciidoctor.org/docs/user-manual/[Asciidoctor User Guide].