Export 3D render via worker job

[philippotto]

Frontend:

• build UI (probably a modal) to kick off job
• Integrate pricing model
• finish explanations texts
• add header image / video
• add validation for user inputs

Backend:

• Validate frontend inputs

Worker

• Finish Blender Animation Job. See https://github.com/scalableminds/voxelytics/pull/3336