Fix: When relativePath: false, use root absolute paths are for images…

[ikfly]

…ve method as use same router with markdown file then remove beginning # (#877、#850)

Summary

When relativePath: false, use root absolute paths for images，a small change as use same router with .md file ,fix #877、#850

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)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

Related issue, if any:

#877 #850

Tested in the following browsers:

• Chrome
• Firefox
• Safari
• Edge
• IE

my tests

• relativePath: false

currentPath: /doc/home
href: images/myImage.png
url: /images/myImage.png

currentPath: /doc/home
href: https://github.com/docsifyjs/docsify/blob/develop/docs/_images/zh-cn/nested-navbar.png
url: https://github.com/docsifyjs/docsify/blob/develop/docs/_images/zh-cn/nested-navbar.png

• relativePath: true

currentPath: /doc/home
href: images/myImage.png
url: /doc/images/myImage.png

currentPath: /doc/home
href: https://github.com/docsifyjs/docsify/blob/develop/docs/_images/zh-cn/nested-navbar.png
url: https://github.com/docsifyjs/docsify/blob/develop/docs/_images/zh-cn/nested-navbar.png

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