Related to webrecorder/browsertrix-crawler#217

We now have the ability in the crawler to specify custom selectors for extracting links, but this has not yet been added to the workflow editor UI.

In sprint planning we also briefly discussed whether we could have a sort of catch-all way of adding crawler flags that don't have corresponding Browsertrix UI elements like this - possibly a text box where users could add arbitrary flags (this would require a good deal of thought and might have security implications).

Tasks

• Wireframes
• Backend: Allow users to manage custom selectors per workflow via API
• Frontend: Configure custom selectors per workflow