feat: add none

[iorisa]

Features

• Add option to disable mermaid to file
• fixbug: #1153

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 74.80%. Comparing base (ba9e3fe) to head (128953b).

Files	Patch %	Lines
metagpt/utils/mermaid.py	0.00%	2 Missing :warning:

:exclamation: Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1155      +/-   ##
==========================================
- Coverage   74.81%   74.80%   -0.02%     
==========================================
  Files         278      278              
  Lines       16890    16892       +2     
==========================================
- Hits        12637    12636       -1     
- Misses       4253     4256       +3     

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.