Update docs to v2 (#278)

* Update docs to v2

* Bump checkout action to v3

* Update installer scripts

* Replace v2 to vX on the docs, minor fixes

* Remove extra whitespace

docs/contributors.md

@@ -26,9 +26,15 @@ With any contribution please take time to consider how this can be tested to mai
 ## Creating new version
 
 Details on versioning can be found here: https://github.com/actions/toolkit/blob/main/docs/action-versioning.md
-Create a new release using the UI. Version format should be `v1.x.x`. Creating a new major version requires reaction from users and should be done only with breaking changes.
-Once the new release is created, the v1 tag needs to be updated as well.
+Create a new release using the UI. Version format should be `vX.Y.Z`. Creating a new major version requires reaction from users and should be done only with breaking changes.
+Once the new release is created, the vX tag needs to be updated as well.
 ```
-git tag -fa v1 -m "Update v1 tag"
-git push origin v1 --force
+git tag -fa vX -m "Update vX tag"
+git push origin vX --force
 ```
+
+For example, if you're publishing v2:
+```
+git tag -fa v2 -m "Update v2 tag"
+git push origin v2 --force
+```