Replace CodiMD with notes.ietf.org (or HedgeDoc)

[eckelcu]

Hi Chairs, Charles,

Excellent document! Fully support - READY with a few nits!

• Reference missing at "Hackdemo Happy Hour (ref) and the Code Lounge (ref) exist..."
• Replace CodiMD with notes.ietf.org (or HedgeDoc)
• I was wondering for the security consideration - can the network/special networking capabilities provided for the hackathon be exploited?
• The document lacks an Informative reference section, all references are inline. Just making sure if that is the correct practice?

Thanks! Dhruv

[eckelcu]

Dhruv had a look and approved the change.