Simplify, minor code clean up

Add products, filter, e.t.c

(FIXED) Found so far:
-parent category should be able to be null
-automatic id assignment; either incrementing counter or something like SELECT AS_BASE64(RANDOM_BYTES(#length))

Remove test data.
Have a complete connection

Set up Docker containers to share MySQL database

For demo:
-Serverside credentials
-Backend route fixes
-Working cart UI (tex, increment button)
-Finalize frontend UI
-Add review db interactions

Misc:
-Report: Cart system, Review system, Final read through

-Input parsing (maybe sprint 3?)
-Error handling and proper return for client instead of just 'console.log(err)'

One as a contentlist element, one as a standalone map.

Currently the directories and path handling are getting a bit cluttered. Proposed fixes:
-Move routing in index.js to outside libraries; divide up into files, grouped by application.
-Group page files by application.
-Find some better way of handling all backend POST routes, current system is prone to cause troubles eventually.

Add products to cart, increment and decrement e.t.c

Move certain debugging text fields in client/src/pages/* to request fields.

Authentication

Update following pages to use database entries as data (100%):
-search
-collection

Match file naming conventions; decide as a group whether to opt for lowercase only/snakecase/etc.

-Add descriptions, Newsletter
-Add subscription to email feature

change tags to prevent extending html. For example:
is not recognized

Add node path for /orderproduct

Style and add more UI touch to each pages