fix: edit_post fileUrlPath with contentDir configured

[genffy]

What does this PR change? What problem does it solve?

• change
  edit_post.html $fileUrlPath variable, use
• solve for
  fix the wrong path with contentDir param is configured
• ⚠️ side effect
  if editPost.URL configured as the end of 'content'(this is contentDir default value ) will get the wrong path,
  but I think the default value should not be write in config file, should use a variable instead

the doc of editPost should be updated, Notice that just config it to the repo with the branch without /content

Was the change discussed in an issue or in the Discussions before?
nop

PR Checklist

• This change adds/updates translations and I have used the template present here.
• I have enabled maintainer edits for this PR.
• I have verified that the code works as described/as intended.
• This change adds a Social Icon which has a permissive license to use it.
• This change does not include any CDN resources/links.
• This change does not include any unrelated scripts such as bash and python scripts.
• This change updates the overridden internal templates from HUGO's repository.

[sonarcloud]

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