Add image of feature flowchart we can link to from docs

[brophdawg11]

Adding an updated version of this diagram in the docs. This isn't linked to anywhere currently but will be once I update our docs for stable middleware.

flowchart TD;
A{"`Is this a <br/>breaking change?`"} -->|No| D("`🚀 Ship **unstable_** API`");
D --> D*["Beta testing"]
D* -->E("`🚀 Remove **unstable_** prefix`")

A -->|Yes| F{"Can the developer opt-in at the call-site?"}
F -->|Yes| D

F -->|No| I("`🚀 Ship **unstable_** API behind **future.unstable_** flag`");
I --> I*[Beta testing]
I* --> J("`🚀 Remove **unstable_** API prefix and rename flag to **future.vN_**`")
J -->|Before next major version| K("🚀 Ship deprecation warnings in current version for users who have not adopted the flag")

K -->|Eventually| L("Ship next version with future flag behavior as the default behavior")

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This was the old version of this doc in case we ever need it