Create documentation (matrix) outlining diffs to vanilla k8s

[anilmurty]

It will be useful to have a matrix that lists out features that are supported in plain/ vanilla Kubernetes but not supported or limitedly supported in Akash. This will be useful for multiple reasons:

1. Having a ready reference for any users/ customers/ providers, when the questions come up, would reduce support burden and distractions.
2. Would be helpful for customers running workoads in k8s and wanting to migrate to Akash (particularly as we look to attract AI training workloads that may be running in AKS, EKS, GKE or ray+k8s)
3. Would help us prioritize feature work taking into account these limitations, so that we're making it easier for folks to adopt Akash.

Here's what I am suggesting:

1. A note about the version of K8s and the version of Akash where this was last updated.
2. A matrix style document that has a list of features that are either not supported or supported in a limited capacity in column 1.
   Column 2 is whether there is support, no support or limited support in Akash
   Column 3 is some notes on why the feature isn't currently supported
   Column 4: reference to any issues created for it in the backlog, if they exist.

Eg:

K8s Feature	Akash State	Notes	Reason	Github reference (if applicable)
Shared persistent storage volumes	Not supported	If a SDL defines a single profile with a persistent storage definition - and that profile is then used by multiple services - individual, unique volumes will be created per service.
Multiple persistent storage volumes per service	Not supported	only a single persistent volume is allowed/supported per service definition in the Akash SDL