feat: add updated defaultbranch image and update missed dev-v8 references to v8/dev

.github/CONTRIBUTING.md

@@ -62,7 +62,7 @@ Great question! The short version goes like this:
 
   * **Build** - build your fork of Umbraco locally as described in [building Umbraco from source code](BUILD.md)
   * **Change** - make your changes, experiment, have fun, explore and learn, and don't be afraid. We welcome all contributions and will [happily give feedback](#questions)
-  * **Commit** - done? Yay! 🎉 **Important:** create a new branch now and name it after the issue you're fixing, we usually follow the format: `temp-12345`. This means it's a temporary branch for the particular issue you're working on, in this case `12345`. When you have a branch, commit your changes. Don't commit to `dev-v8`, create a new branch first.
+  * **Commit** - done? Yay! 🎉 **Important:** create a new branch now and name it after the issue you're fixing, we usually follow the format: `temp-12345`. This means it's a temporary branch for the particular issue you're working on, in this case `12345`. When you have a branch, commit your changes. Don't commit to `v8/dev`, create a new branch first.
   * **Push** - great, now you can push the changes up to your fork on GitHub
   * **Create pull request** - exciting! You're ready to show us your changes (or not quite ready, you just need some feedback to progress). GitHub has picked up on the new branch you've pushed and will offer to create a Pull Request. Click that green button and away you go.
 
@@ -155,7 +155,7 @@ To find the general areas of something you're looking to fix or improve, have a
 
 ### Which branch should I target for my contributions?
 
-We like to use [Gitflow as much as possible](https://jeffkreeftmeijer.com/git-flow/), don't worry if you are not familiar with it. The most important thing you need to know is that when you fork the Umbraco repository, the default branch is set to something, usually `dev-v8`. Whatever the default is, that's where we'd like you to target your contributions.
+We like to use [Gitflow as much as possible](https://jeffkreeftmeijer.com/git-flow/), don't worry if you are not familiar with it. The most important thing you need to know is that when you fork the Umbraco repository, the default branch is set to something, usually `v8/dev`. Whatever the default is, that's where we'd like you to target your contributions.
 
 ![Which branch should I target?](img/defaultbranch.png)
 

.github/README.md

@@ -1,4 +1,4 @@
-# [Umbraco CMS](https://umbraco.com) · [![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg)](../LICENSE.md) [![Build status](https://umbraco.visualstudio.com/Umbraco%20Cms/_apis/build/status/Cms%208%20Continuous?branchName=dev-v8)](https://umbraco.visualstudio.com/Umbraco%20Cms/_build?definitionId=75) [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](CONTRIBUTING.md) [![pullreminders](https://pullreminders.com/badge.svg)](https://pullreminders.com?ref=badge)
+# [Umbraco CMS](https://umbraco.com) · [![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg)](../LICENSE.md) [![Build status](https://umbraco.visualstudio.com/Umbraco%20Cms/_apis/build/status/Cms%208%20Continuous?branchName=v8/dev)](https://umbraco.visualstudio.com/Umbraco%20Cms/_build?definitionId=75) [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](CONTRIBUTING.md) [![pullreminders](https://pullreminders.com/badge.svg)](https://pullreminders.com?ref=badge)
 
 Umbraco is the friendliest, most flexible and fastest growing ASP.NET CMS, and used by more than 500,000 websites worldwide. Our mission is to help you deliver delightful digital experiences by making Umbraco friendly, simpler and social.