231 add 404 page

[Lucaslgd02]

Describe your changes

Add a 404 page with a button that redirects to dashboard

How to test the feature

Go to the POS
Change the url to something that has no page
It will display the 404 page

Issue ticket number and link

Closes #231

Checklist before requesting a review

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have performed a self-review of my code
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Documentation has been updated as required
  If a single item in this checklist is not checked, the pull request cannot be accepted