Update to 0.55.5

Changelog:

• Provide more detailed errors in Where
• Regenerate docs helper
• Update blackfriday to v1.5.2
• Fix nil compare in eq/ne for interface values
• Fix hugo package name and add godocs
• Fix permalink in sitemap etc. when multiple permalinkable output formats
• Fix PrevInSection/NextInSection for nested sections
• Fix concurrent initialization order

PR: 237728
Submitted by: ben.lavery@hashbang0.com (maintainer)
Sponsored by: Netzkommune GmbH