Update stackblitz iframes to use ctl=1 to prevent focus stealing #5784
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The stackblitz iframe steals focus after it loads when not using ctl=1. It's a jarring experience when reading the documentation or browsing the homepage because this focus-stealing also scrolls the iframe into view and they're below the fold.
Also uses the main branch here rather than feature branches in other repos that might be deleted later, I suspect this was just missed after merging the vanilla-js-plugin example by @StyleT (#5717)
To notice the difference, try comparing the UX between some of the docs pages (wait a few seconds for stackblitz to load on the before examples):