Add note to install docs to use doc for latest released version

[ckadner]

We need to figure out a better way to handle these cross-version changes, like adding a note with a link at the top of the Quickstart Guide (and other install docs) to point users to the last released version of the document and reserve the main version for developers and early adopters who do not need to clone the last release ...

We had this problem several times before when we updated the Quickstart Guide for the kustomize version compatibility, ClusterServingRuntime, and namespace-scope mode.

@rafvasq @tjohnson31415 @njhill

Originally posted by @ckadner in #364 (comment)

[AshleyZhao]

Can I take on this issue? Thanks

[rafvasq]

Sure @AshleyZhao, let us know if you need any more clarification

[AshleyZhao]

Hi @rafvasq,

Sorry I hadn't been able to get back to you for some time. I have some minor questions about the note I'm trying to add and thought a comment would be the best place.

a. Do you prefer links to the earlier releases such as:

Tip or Attention or Info or Note: If you are working with a specific version of ModelMesh and not in a development environment, use one of the following guides:

• Quick Start Guide Release 0.7
• Quick Start Guide Release 0.8
• Quick Start Guide Release 0.9
• Quick Start Guide Release 0.10
• Quick Start Guide Release 0.11

b. Do you prefer the note to be more descriptive:

Tip or Attention or Info or Note: If you are working with a specific version of ModelMesh and not in a development environment, switch to an earlier version of this document by selecting the appropriate Git branch.

Lmk of any other improvements I can make!

(Also I think this will impact more than one file, but for my PR will be just for one file for now.)

Thanks in advance.

[rafvasq]

Hey @AshleyZhao, I think the idea here is something like the first but only including the link to the latest release. For the quickstart, maybe it would look like

Note: To install the latest stable release, please follow the quickstart guide for v0.11 .

@ckadner please feel free to disagree or add anything else you'd like to be done here!

[AshleyZhao]

Thanks Rafael, have a great rest of the week.
Please let me know if you have further suggestions @ckadner, thanks in advance.
For reference, here is my PR, #398.