stories.jenkins.io - update to remove form from intro

[kmartens27]

Since we are no longer using a form to capture user stories, the text has been changed to reflect the fact that users should submit pull requests to add their stories.

[lemeurherve]

Mmh... build broken, will take a look next week.

[halkeye]

https://til.hashrocket.com/posts/lizdv5cobh-install-all-versions-in-tool-versions-with-asdf

i'll add an asdf install for now so it just installs the .tool-version