USER STORY: Error Pages

[jensbrauer]

As a visitor/user I can view a message in case of site errors so that I understand what whent wrong and how to proceed from there

[jensbrauer]

Requirements

• [ ] When a server error is raised, a custom page with navigetion back to index.html should be present
• [ ] When a user tries to load a page that is not found, a custom 404 page with navigetion back to index.html should be present

[jensbrauer]

TASKS

• [x] Create 404 template

• [x] Create 500 template