Added fetchPrice example, reorganized HC docs

[katieclay]

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Overview

Added a brief explanation of the fetchPrice contract

Changes

Describe your changes and implementation choices. More details make PRs easier to review.

• Added new file for fetchPrice
• Reorganized HC docs to accommodate for both examples, including TOC tree

Testing

n/a

[katieclay]

Need to ask about server.register_function(offchain_addsub2, selector("offchain_addsub2(uint32,uint32)")); other example selector()s' parameter functions don't have "offchain_" in them.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.10%. Comparing base (7d1a7c2) to head (91b7a5a).

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #247   +/-   ##
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  Coverage    78.10%   78.10%           
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  Files           28       28           
  Lines         2137     2137           
========================================
  Hits          1669     1669           
  Misses         407      407           
  Partials        61       61           

Flag	Coverage Δ
cannon-go-tests	78.10% <ø> (ø)

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[mmontour1306]

This is correct from a documentation perspective (matches the code) but I'm not sure if the code itself makes sense. Kevin, can you check this? I'm not sure why there's an "emit" followed by a "revert", or why it's splitting the error code and 'ret' string across two different events.

[mmontour1306]

It's not a change in this PR but I noticed a typo in this file. In the "why is that" section you show the JSON-RPC request sent to the server, including a method field:

"method":"ASD97e0d7ba",

That should be:
"method":"97e0d7ba",

[mmontour1306]

Made a couple of comments but it looks OK to me overall.