Adds a more step by step guide to Federation (#9)

* Small restructure of how-to guides, and improve Federation guide

* Fix incorrect code blocks

* Update modules/ROOT/pages/how-to-guides/integrations/nextjs.adoc

Co-authored-by: Lidia Zuin <[email protected]>

* Update modules/ROOT/pages/how-to-guides/integrations/nextjs.adoc

Co-authored-by: Lidia Zuin <[email protected]>

* Apply suggestions from code review

Co-authored-by: Lidia Zuin <[email protected]>

* Remove project creation guide

* Restructure of integrations

* Bold instead of headings

---------

Co-authored-by: Lidia Zuin <[email protected]>

Author: darrellwarde

modules/ROOT/content-nav.adoc

@@ -76,9 +76,9 @@
 
 *** xref:reference/driver-configuration.adoc[]
 
-** xref:guides/index.adoc[]
-*** xref:guides/apollo-federation.adoc[]
-*** xref:guides/frameworks/nextjs.adoc[]
+** Frameworks and integrations
+*** xref:integrations/apollo-federation.adoc[]
+*** xref:integrations/nextjs.adoc[]
 
 ** xref:troubleshooting.adoc[]