Remove manual list of guides

Issue gh-1295

docs/modules/ROOT/pages/how-to.adoc

@@ -2,13 +2,3 @@
 [[how-to]]
 = How-to Guides
 :page-section-summary-toc: 1
-
-[[how-to-overview]]
-== List of Guides
-
-* xref:guides/how-to-pkce.adoc[Authenticate using a Single Page Application with PKCE]
-* xref:guides/how-to-social-login.adoc[Authenticate using Social Login]
-* xref:guides/how-to-ext-grant-type.adoc[Implement an Extension Authorization Grant Type]
-* xref:guides/how-to-userinfo.adoc[Customize the OpenID Connect 1.0 UserInfo response]
-* xref:guides/how-to-jpa.adoc[Implement core services with JPA]
-* xref:guides/how-to-custom-claims-authorities.adoc[Add authorities as custom claims in JWT access tokens]