Configure Zenodo additional account

[craig-willis]

Per mockups (https://wholetale.org/wholetale-css-mockup/src/settings.html), implement the connect/disconnect operations for API-key based account

• Connect additional accounts page displays "Zenodo" provider with "Connect Account" button
• Selecting "Connect Account" displays modal with the following:
  • Drop-down list of available Zenodo targets (required)
  • Text box to enter API key (required)
  • Link to "Get from Zenodo" linking to the API Keys page
• Selecting "Connect" with target selected and API key specified closes the modal and saves the configuration
• Connect additional accounts page displays "Zenodo" provider with configured target listed
• Selecting "Disconnect" removes the configured account