Split specification into one page per main section

[chalin]

Might it make sense to break the single spec file into a directory with one file/page per spec section (maybe the FAQ and the "Future possibilites" can stay in the top-level README)? I'm asking the following question in the context of the following request:

• Add OpAMP spec to the specs list opentelemetry.io#2795

That is, before we publish the spec to the OTel website for the first time, it might be good to consider its structure.

Possible sample structure:

/specification
|- README.md
|- communication-model.md
|- operation.md
...

/cc @svrnm @cartermp @tigrannajaryan

[tigrannajaryan]

@chalin The one doc for the spec worked well so far for the workgroup. We also have one doc for OTLP and typically protocol RFCs also are one large doc. I suggest we keep it as is. Splitting would also require lots of link rewritting, I am not sure it is worth it.

[chalin]

👍