feat: add docs.jenkins.io storage account and file share

[lemeurherve]

This PR adds the storage account and file share that will be used by the nginx-website release on publick8s cluster to serve on docs.origin.jenkins.io the content generated from https://github.com/jenkins-infra/docs.jenkins.io/.

Ref:

• To host versioned jenkins.io docs on docs.jenkins.io helpdesk#3885 (comment)

[dduportal]

• Plan: 3 to add, 0 to change, 0 to destroy. ✅
• We're using a Standard account storage. It means we'll have to check, in a few months, the cost incurred by this service as we're billed by transactions (for each mount, read but also write)