Add FAQ on how to leave crate open for adoption (#5216)

* Add FAQ on how to leave crates open for adoption

Provides a section in the policies page to communicate to users
how they could leave a crate open for transferring. The idea was
first shared by @carols10cents.

* Adjust crate removal policy wording

Co-authored-by: Tobias Bieniek <[email protected]>

Author: LeoBorai

app/templates/policies.hbs

@@ -42,6 +42,24 @@
   Code of Conduct.
 </p>
 
+<h3 id='delete-crate'><a href='#delete-crate'>How can I delete a crate I own from the registry?</a></h3>
+
+<p>
+  You can't delete crates from the registry, but you can leave it open for
+  transferring ownership to others.
+</p>
+
+<p>
+  To do this, you must publish a version with a message in the README
+  communicating to crates.io support team that you consent to transfer the
+  crate to the first person who asks for it:
+</p>
+
+<blockquote>
+  I consent to the transfer of this crate to the first person who asks
+  [email protected] for it.
+</blockquote>
+
 <h3 id='squatting'><a href='#squatting'>Squatting</a></h3>
 
 <p>