Fix "read online" link
On https://gitlab.com/inkscape/inkscape-docs/manuals (really, https://gitlab.com/inkscape/inkscape-docs/manuals/-/blob/master/README.md ), the first big "Read Online" link is broken.
Currently, it points to https://inkscape-manuals.readthedocs.io/why-use-inkscape.html
Should it point to https://inkscape-manuals.readthedocs.io/en/latest/ ?