Bug Report

Docsify doesnt recognise letter & - in sidebar it's not generated in link

https://web-platform-npevsr.stackblitz.io/

Steps to reproduce

Starters & Themes

https://web-platform-npevsr.stackblitz.io/#/?id=starters--themes

Link is not generated as starters & themes in sidebar
Starters & Themes

while it's normally generated on main document in section
https://web-platform-npevsr.stackblitz.io/#/?id=starters-amp-themes

so amp in sidebar is what's missing

Current behaviour

since link in sidebar is generated without that letter, navigation menu doesnt take me to that section. as it should

Other relevant information

• Docsify version:
  Current one

Please create a reproducible sandbox

https://web-platform-npevsr.stackblitz.io/