docs: Remove dead links in docs and improve SOP Class Handler docs (#1593)

* fix docs dead links

* add examples to SOP handler docs

docs/latest/development/contributing.md

@@ -114,8 +114,8 @@ the tips above will help ensure your changes are reviewed.
 
 ## Testing contribution pull requests
 
-OHIF uses [netlify](netlify.com) so that pull requests are autogenerated and
-available for testing.
+OHIF uses [netlify](https://www.netlify.com/) so that pull requests are
+autogenerated and available for testing.
 
 For example, [this url][example-url] allows you to test [pull request 237, the
 request that created this FAQ entry,][pr-237] using data pulled from Amazon S3.

docs/latest/development/testing.md

@@ -132,7 +132,7 @@ feature `X` or scenario `Y`? Open an issue and let's discuss.
 [flow-org]: https://flow.org/
 <!-- Talks -->
 [assert-js-talks]: https://www.youtube.com/playlist?list=PLZ66c9_z3umNSrKSb5cmpxdXZcIPNvKGw
-[kent-talk]: https://www.youtube.com/watch?list=PLV5CVI1eNcJgNqzNwcs4UKrlJdhfDjshf
+[kent-talk]: https://www.youtube.com/watch?v=Fha2bVoC8SE
 [gleb-talk]: https://www.youtube.com/watch?v=5FnalKRjpZk
 [kent-blog]: https://kentcdodds.com/blog/unit-vs-integration-vs-e2e-tests
 <!-- Images -->