fix: markdownify footer content

Signed-off-by: Jaime Silvela <[email protected]>

Author: jsilvela

content/footer/footer.md

@@ -6,6 +6,6 @@ cta:
 
 Copyright © CloudNativePG a Series of LF Projects, LLC.
 
-For website terms of use, trademark policy and other project policies please see <a href="https://lfprojects.org/policies/">LF Projects, LLC Policies</a>.
+For website terms of use, trademark policy and other project policies please see [LF Projects, LLC Policies](https://lfprojects.org/policies/).
 
 Postgres, PostgreSQL and the Slonik Logo are trademarks or registered trademarks of the PostgreSQL Community Association of Canada, and used with their permission.