Rename to "What's Crossplane"

Vale says it's better.

Signed-off-by: Nic Cope <[email protected]>

Author: negz

content/v2.0-preview/_index.md

@@ -12,7 +12,7 @@ for platform engineering.
 
 Crossplane organizes its documentation into the following sections:
 
-* [What is Crossplane?]({{<ref "what-is-crossplane">}}) introduces Crossplane
+* [What's Crossplane?]({{<ref "whats-crossplane">}}) introduces Crossplane
   and explains why you should use it.
 
 * [Get Started]({{<ref "get-started">}}) explains how to install Crossplane and

content/v2.0-preview/what-is-crossplane/_index.md renamed to content/v2.0-preview/whats-crossplane/_index.md

@@ -1,5 +1,5 @@
 ---
-title: What is Crossplane?
+title: What's Crossplane?
 weight: 3
 description: Learn what Crossplane is and why you'd use it.
 ---