introduce editPost.appendQueryParam

[philsch]

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

The editPost feature is great to invite visitors to contribute. Linking to Github code, the default "rendered" view of a markdown is sometimes not so useful. This PR introduces a parameter editPost.appendQueryParam to allow to add query parameters to the final URL. This allows to create a link like https://github.com/adityatelange/hugo-PaperMod/blob/exampleSite/content/posts/papermod/papermod-installation.md?plain=1 to show the plain representation of the markdown.

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

No

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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