Add banner indicating HC is under upgrade

[jyellick]

Updates the docs to reflect that hybrid compute is currently being upgraded and the existing docs are for the legacy version.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.62%. Comparing base (d5d554b) to head (a6e6edc).

❗ Current head a6e6edc differs from pull request most recent head ab1455b. Consider uploading reports for the commit ab1455b to get more accurate results

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #147       +/-   ##
===========================================
- Coverage    28.21%   0.62%   -27.59%     
===========================================
  Files          168      94       -74     
  Lines         7294    2396     -4898     
  Branches      1311     546      -765     
===========================================
- Hits          2058      15     -2043     
+ Misses        5130    2381     -2749     
+ Partials       106       0      -106     

Flag	Coverage Δ
cannon-go-tests	?
chain-mon-tests	?
common-ts-tests	?
contracts-bedrock-tests	0.62% <ø> (ø)
contracts-ts-tests	?
core-utils-tests	?
sdk-next-tests	?
sdk-tests	?

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see 74 files with indirect coverage changes