Remove old product lineup image (#977)

## Description

The Models landing page references an obsolete image that shows the old
product stack. This PR updates the page to reference the new one. Also
removed some `docusaurus` and `yarn` mentions in the PR template that
won't be needed going forward.

.github/pull_request_template.md

@@ -1,15 +1,7 @@
 ## Description
 
-What does the pull request do? If it fixes a bug or resolves a feature request, be sure to link to that issue.
+What does the pull request do? 
 
 ## Ticket
 
-Does this PR fix an existing issue? If yes, provide a link to the ticket here:
-
-## Checklist
-
-Check if your PR fulfills the following requirements. Put an `X` in the boxes that apply.
-
-- [ ] Files I edited were previewed on my local development server with `yarn start`. My changes did not break the local preview.
-- [ ] Build (`yarn docusaurus build`) was run locally and successfully without errors or warnings.
-- [ ] I merged the latest changes from `main` into my feature branch before submitting this PR.
+Does this PR fix an existing issue? If yes, provide a link here.

content/guides/models/_index.md

@@ -9,7 +9,7 @@ no_list: true
 
 W&B Models is the system of record for ML Practitioners who want to organize their models, boost productivity and collaboration, and deliver production ML at scale. 
 
-{{< img src="/images/general/models.png" alt="" >}}
+{{< img src="/images/general/architecture.png" alt="" >}}
 
 With W&B Models, you can: