Implement responsive images

[dixonge]

• [x] Resize all images to max of 1122px any direction
• [ ] Copy all images to Cloudinary
• [ ] Add picture.js and config to .eleventy.js
• [ ] Replace images with shortcode in templates

[dixonge]

Images uploaded to Cloudinary, picture.js added, code added to .eleventy.js, code swapped in all articles