Error page mockup

**What**
Provides a mockup for the error/ 404 page

**Why**
Having a mockup to use as reference will be helpful when creating it

**How**
- Using figma, exporting the design as an image, and pushing it to the `/docs` directory
- Contact ironbe on the discord server for access to the project figma
- Can also use your own figma
- Using any other tool like adobe xd or pen and paper

**Requirements**
- some creative 404 message & design