Remove leading slash in documentation for apache redirect rule

[bonham]

This PR is about a small glitch in the documentation about redirect rules when setting up with apache:

When deploying to a subfolder instead of root, the example from the documentation would not work since apache will redirect from /subfolder/something to /index.html instead of /subfolder/something to /subfolder/index.html

If the leading slash is removed as proposed, the example would work for both - deployment to root or to subfolder.

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