improve google lighthouse rating of landing page

[schdief]

Current:

• Performance: 26
• Accessability: 48
• Best Practices: 85
• SEO: 67

Target:

• Performance: 95
• Accessability: 95
• Best Practices: 95
• SEO: 95

Report:
https://lighthouse-dot-webdotdevsite.appspot.com/lh/html?url=http://moveez.de:444#performance

[schdief]

Performance up to 33%

[schdief]

@deradre performance of /title is rated at 87% and our / is at 33%, biggest reason is main.js - not sure whether we are gaining anything from react (at least not at the landing page), but it seems like we are losing a lot and speed on the landing page is important

[schdief]

latest results:

2019-08-07T18:51:29.3541709Z - Running Lighthouse on https://gui-master-uat.moveez.de ...
2019-08-07T18:51:29.3542586Z
2019-08-07T18:51:43.4859939Z performance: 98
2019-08-07T18:51:43.4860745Z accessibility: 100
2019-08-07T18:51:43.4862234Z best-practices: 86
2019-08-07T18:51:43.4862697Z seo: 83
2019-08-07T18:51:43.4862809Z pwa: 56
2019-08-07T18:51:43.4869919Z All checks are passing. 🎉

ToDo:
best-practices: 86 -> 95
seo: 83 -> 95
pwa: 56 -> 95