Review develop and master release assets

[alandefreitas]

When new release semver versions are created, the releases

https://github.com/cppalliance/mrdocs/releases/tag/develop-release

and

https://github.com/cppalliance/mrdocs/releases/tag/master-release

in

https://github.com/cppalliance/mrdocs/releases

accumulate assets (because the filenames are different) instead of getting rid of the wrong assets.

In turn, this also breaks the assets linked in

https://www.mrdocs.com/docs/mrdocs/install.html

which also needs to be reviewed