Pretiffy the welcome and the "500 error" pages #833
Merged
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Issue
The welcome page (when creating a new project) and the debugging page (when a 500 error is thrown) are not very nice. This PR makes them prettier.
This debug page displays also more information (file name and numbers of the row and the column).
Solution and steps
Before
![500 before](https://user-images.githubusercontent.com/13604533/100640132-5909d800-3336-11eb-9dbb-a6c29604fc5a.png)
After
![500 after](https://user-images.githubusercontent.com/13604533/100640145-5d35f580-3336-11eb-994b-57dfe7c2e20e.png)
Before
![welcome before](https://user-images.githubusercontent.com/13604533/100640165-61621300-3336-11eb-9b03-bce397614151.png)
After
![welcome after](https://user-images.githubusercontent.com/13604533/100640182-67f08a80-3336-11eb-97f4-88d38ed87952.png)
Checklist