meson: fix creation of html symlinks

This adds two somewhat independent rules:
1. to create symlinks to html pages in the build directory
2. to create symlinks in the installation directory

The second part needs to be coded separately, because telling meson to install
the symlinks created in step 1. results in a copy of the target, instead of a
symlink. So step 2. needs to ignore the result of 1. and create the symlink again.

Fixes #5863.

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