Create a new template for activity page offline availability

[yokwejuste]

Summary

For this PR, we will be using waesyprint python library to convert an html jinja template to a PDF. This will include us using variables in a context passed from the view endpoint.
Closes #899

Changes

• Establish a util function for PDF rendering
• Create the Jinja template for the Activity page download (conditioning, filters...)
• Create a view route for the activity download for each activity
• Optimize the loading of images on the PDF (pdf rendering optimization)
  • From Robodash
  • From the Cloudinary
• Build a QR code generator for the Activity link
• Performing test

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[yokwejuste]

Resolved conflicts after previous merge.

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