Summary

#1724
Docsify depends on an ancient version of marked which has some CVEs. The fix it to upgrade to marked v4.

What kind of change does this PR introduce?

Bugfix

For any code change,

• Related documentation has been updated if needed
• Related tests have been updated or tests have been added

Does this PR introduce a breaking change? (check one)

• [X ] Yes
• No

If yes, please describe the impact and migration path for existing applications:
marked node dependency upgraded to version 4

Related issue, if any:

Tested in the following browsers:

• Chrome
• Firefox
• Safari
• Edge
• IE