[docsy] Add missing link to Videos page, and adjust Contributor page (#83)

Author: chalin

content/en/docs/get-started/_index.md

@@ -15,7 +15,7 @@ Want to learn more about TUF? Select a role to get started:
 
 </div>
 
-You can also check out our [Videos][] section to see how to implement TUF
-practically.
+You can also check out our [Videos](/resources/videos/) section to see how to
+implement TUF practically.
 
 If none of these roles apply to you, let us know.

content/en/docs/get-started/contributor.md

@@ -4,15 +4,12 @@ weight: 17
 description: Learn how to contribute to TUF
 ---
 
-There are many opportunities to contribute to TUF project.You can contribute to
-the Spec or documentation.
+There are many opportunities to contribute to TUF project. You can contribute to
+the [specification](/specifications/) or [documentation](/docs/).
 
-For guidance on how to contribute, the
-[TUF Contributor Guide](https://github.com/theupdateframework/community/blob/main/CONTRIBUTING.md)
-provides details on the Contributor License Agreement and the Code of Conduct.
+For guidance on how to contribute, see the
+[TUF Contributor Guide](https://github.com/theupdateframework/community/blob/main/CONTRIBUTING.md).
 
 For more information on how to contribute, reach out to the
 [TUF community site](/community/) or check out areas of contribution on GitHub
 [The Update Framework](https://github.com/theupdateframework).
-
-[Edit this page](https://github.com/theupdateframework/theupdateframework.io)