Add service container docs

[josephmancuso]

Need documentation again on the service container. May be able to adapt M3 documentation

[girardinsamuel]

I agree. It should be written in ARCHITECTURE section. I guess this page https://docs.masoniteproject.com/architectural-concepts/service-container from M3 can totally be adapted/partially rewritten.

The hierarchy (sections / titles) of the page should be made easier to follow and maybe less deep

[girardinsamuel]

Actually here too much titles are at the same level

Maybe the high level sections could be:

• Main Concepts (what is a container, theory of binding/resolving, singleton ...)
• Interacting with the container (help on using it)
• Advanced (more advanced usage of it: hooks, strict, override...)

[girardinsamuel]

Looks okay to me now. We could have a summary on the right or more hierarchy but fine for now.