Reference conference talk in README (#877)

While there, fix some URLs broken by eafb738.

README.md

@@ -15,9 +15,11 @@ focussing on maintainability, consistency and avoidance of common pitfalls.
 > Error Prone is a static analysis tool for Java that catches common
 > programming mistakes at compile-time.
 
-Read more on how Picnic uses Error Prone (Support) in the blog post [_Picnic
-loves Error Prone: producing high-quality and consistent Java
-code_][picnic-blog-ep-post].
+To learn more about Error Prone (Support), how you can start using Error Prone
+in practice, and how we use it at Picnic, watch the conference talk
+[_Automating away bugs with Error Prone in practice_][conference-talk]. Also
+consider checking out the blog post [_Picnic loves Error Prone: producing
+high-quality and consistent Java code_][picnic-blog-ep-post].
 
 [![Maven Central][maven-central-badge]][maven-central-search]
 [![Reproducible Builds][reproducible-builds-badge]][reproducible-builds-report]
@@ -265,6 +267,7 @@ channel; please see our [security policy][security] for details.
 [bug-checks-identity-conversion]: https://github.com/PicnicSupermarket/error-prone-support/blob/master/error-prone-contrib/src/main/java/tech/picnic/errorprone/bugpatterns/IdentityConversion.java
 [codeql-badge]: https://github.com/PicnicSupermarket/error-prone-support/actions/workflows/codeql.yml/badge.svg?branch=master&event=push
 [codeql-master]: https://github.com/PicnicSupermarket/error-prone-support/actions/workflows/codeql.yml?query=branch:master+event:push
+[conference-talk]: https://www.youtube.com/watch?v=-47WD-3wKBs
 [contributing]: https://github.com/PicnicSupermarket/error-prone-support/blob/master/CONTRIBUTING.md
 [contributing-pull-request]: https://github.com/PicnicSupermarket/error-prone-support/blob/master/CONTRIBUTING.md#-opening-a-pull-request
 [error-prone-bugchecker]: https://github.com/google/error-prone/blob/master/check_api/src/main/java/com/google/errorprone/bugpatterns/BugChecker.java
@@ -274,8 +277,8 @@ channel; please see our [security policy][security] for details.
 [error-prone-installation-guide]: https://errorprone.info/docs/installation#maven
 [error-prone-orig-repo]: https://github.com/google/error-prone
 [error-prone-pull-3301]: https://github.com/google/error-prone/pull/3301
-[github-actions-build-badge]: https://github.com/PicnicSupermarket/error-prone-support/actions/workflows/build.yaml/badge.svg
-[github-actions-build-master]: https://github.com/PicnicSupermarket/error-prone-support/actions/workflows/build.yaml?query=branch:master&event=push
+[github-actions-build-badge]: https://github.com/PicnicSupermarket/error-prone-support/actions/workflows/build.yml/badge.svg
+[github-actions-build-master]: https://github.com/PicnicSupermarket/error-prone-support/actions/workflows/build.yml?query=branch:master&event=push
 [google-java-format]: https://github.com/google/google-java-format
 [idea-288052]: https://youtrack.jetbrains.com/issue/IDEA-288052
 [license-badge]: https://img.shields.io/github/license/PicnicSupermarket/error-prone-support

website/README.md

@@ -51,11 +51,11 @@ bundle install
 # Deployment
 
 The website is regenerated and deployed using the
-[`deploy-website.yaml`][error-prone-support-website-deploy-workflow] GitHub
+[`deploy-website.yml`][error-prone-support-website-deploy-workflow] GitHub
 Actions workflow any time a change is merged to `master`.
 
 [error-prone-support-website]: https://error-prone.picnic.tech
-[error-prone-support-website-deploy-workflow]: https://github.com/PicnicSupermarket/error-prone-support/actions/workflows/deploy-website.yaml
+[error-prone-support-website-deploy-workflow]: https://github.com/PicnicSupermarket/error-prone-support/actions/workflows/deploy-website.yml
 [jekyll]: https://jekyllrb.com
 [jekyll-docs]: https://jekyllrb.com/docs
 [jekyll-docs-installation]: https://jekyllrb.com/docs/installation