Setup pipeline to maintain screenshots

[vitonsky]

We don't have process to maintain a screenshots, let's introduce it. We need a script to build preview images.

• Create HTML template with background, texts and place for screenshot
• Provide JSON with texts and path to file with screenshot
• Build HTML page and apply CSS
• Render page once and save image
• Resize image for browser stores

[vitonsky]

This task done, because we introduce svg files with a templates for each screen. Texts in SVG files can be analyzed and handled by utils, so maintaining can be automated.