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Describe the feature request

Move the proton-gen-docs from using github.com/russross/blackfriday/v2 to https://github.com/yuin/goldmark

The istio.io site moved from using BlackFriday to Goldmark as Hugo had deprecated and removed BlackFriday. I notice we still use BlackFriday in the get-docs code. Although I haven't seen any issues with the generated code/pages, it might be beneficial to move to the same as used by istio.io.

Describe alternatives you've considered

None. Maybe there is a better library to use, but I didn't find one.

Affected product area (please put an X in all that apply)

[ ] Ambient
[ ] Docs
[ ] Installation
[ ] Networking
[ ] Performance and Scalability
[ ] Extensions and Telemetry
[ ] Security
[x] Test and Release
[ ] User Experience
[ ] Developer Infrastructure

Affected features (please put an X in all that apply)

[ ] Multi Cluster
[ ] Virtual Machine
[ ] Multi Control Plane

Additional context