docs: Update documentation about publishing a dashboard

[hverlin]

SUMMARY

Add a section after https://superset.apache.org/docs/using-superset/creating-your-first-dashboard#manage-access-to-dashboards on how to publish a dashboard.

This should help users understand that they also need to publish a dashboard to make it available to other users. It's a common error as the "publish" button is hard to find.

Note: there is a section on the other page here: https://superset.apache.org/docs/using-superset/exploring-data#publishing-your-dashboard however, it feels a bit out of place with the rest of the content on the page. I have kept it for now.
I have also made the link to the preset docs a bit more visible, as it contains a lot of useful information.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

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