feat: update CSP nonce for reveal.js 3.9.2 speaker notes feature
feat: update CSP nonce for reveal.js 3.9.2 speaker notes feature

Signed-off-by: Max Wu <5423a0a0c940afd544cee330c672fe12652d7e4c@gmail.com>

hackmdio/hackmd,jackycute/HackMD,jackycute/HackMD,jackycute/HackMD,hackmdio/hackmd,hackmdio/hackmd