text: Title: Webapp: Pagespeed improvements
  Body: The pagespeed of the webpage (webapp) could be improved.
  
  ## Problem
  
  Currently the reported First Contentful Paint for mobile devices is 10.2 s which is very high.
  
  https://pagespeed.web.dev/report?url=https%3A%2F%2Fdesec.io%2F&form_factor=mobile
  
  ## Suggestions by report
  
  * Eliminate render-blocking resources
  * Enable text compression
  * Reduce unused CSS
  * Ensure text remains visible during webfont load
  
  ## Comments and possible solutions
  
  Eliminate render-blocking resources:
   * enabling text compression also solves this problem
   * no explicit solution recommendable
  
  Enable text compression:
  * can be enabled in the nginx config
  * current nginx supports gzip and brotli (better gzip for modern browsers)
  * just for for static content, not for API because of security problem BREACH
  * biggest impact: **halves the loading time**
  
  Reduce unused CSS: 
  * ~90kb by PR #630
  
  Ensure text remains visible during webfont load:
  * no action required, because for font can not be improved
  * for font `roboto` improvement was done in #626
  
  ## Current pagespeed reports
  ![grafik](https://user-images.githubusercontent.com/7337347/186988381-27924b3e-8baa-485c-9ca3-82b0ef68326f.png)
  ![grafik](https://user-images.githubusercontent.com/7337347/186988417-b6ae0a26-af22-4afd-867a-3a412b67a442.png)
  
  