Implement One Form block

[vladciocoiu]

Please always provide the GitHub issue(s) your PR is for, as well as test URLs where your change can be observed (before and after):

Fix #54

Test URLs:

• Original: https://www.esri.com/en-us/capabilities/imagery-remote-sensing/capabilities/management
• Before: https://main--esri--aemsites.hlx.live/en-us/capabilities/imagery-remote-sensing/capabilities/management
• Draft: https://add-form-block--esri--aemsites.hlx.live/drafts/vciocoiu/form
• After: https://add-form-block--esri--aemsites.hlx.live/en-us/capabilities/imagery-remote-sensing/capabilities/management