Remove V3 support, update readme (#10872)

.github/ISSUE_TEMPLATE/bug.yml

@@ -14,7 +14,7 @@ body:
 
   - type: markdown
     attributes:
-      value: Chart.js versions lower then 3.x are NOT supported anymore, new issues will be disregarded.
+      value: Chart.js versions lower then 4.x are NOT supported anymore, new issues will be disregarded.
 
   - type: textarea
     attributes:

.github/release-drafter.yml

@@ -44,7 +44,7 @@ template: |
   # Essential Links
 
   * [npm](https://www.npmjs.com/package/chart.js)
-  * [Migration guide](https://www.chartjs.org/docs/latest/getting-started/v3-migration)
+  * [Migration guide](https://www.chartjs.org/docs/latest/migration/v4-migration.html)
   * [Docs](https://www.chartjs.org/docs/latest/)
   * [API](https://www.chartjs.org/docs/latest/api/)
   * [Samples](https://www.chartjs.org/docs/latest/samples/)

README.md

@@ -15,7 +15,7 @@
 
 ## Documentation
 
-All the links point to the new version 3 of the lib.
+All the links point to the new version 4 of the lib.
 
 * [Introduction](https://www.chartjs.org/docs/latest/)
 * [Getting Started](https://www.chartjs.org/docs/latest/getting-started/index)
@@ -27,7 +27,7 @@ All the links point to the new version 3 of the lib.
 * [Popular Extensions](https://github.com/chartjs/awesome)
 * [Samples](https://www.chartjs.org/samples/)
 
-In case you are looking for the docs of version 2, you will have to specify the specific version in the url like this: [https://www.chartjs.org/docs/2.9.4/](https://www.chartjs.org/docs/2.9.4/)
+In case you are looking for an older version of the docs, you will have to specify the specific version in the url like this: [https://www.chartjs.org/docs/2.9.4/](https://www.chartjs.org/docs/2.9.4/)
 
 ## Contributing