Merge branch 'st6' into 'main'

Doc/Doxygen/user/Doxyfile.in

hugo/config.toml

hugo/content/installation/building/unix/third-party.md

hugo/layouts/partials/breadcrumb2.html

hugo/layouts/partials/head.html

hugo/layouts/partials/navbar.html

hugo/layouts/shortcodes/installer-win-name.html

hugo/layouts/shortcodes/recommended-wininstaller.html

hugo/layouts/shortcodes/ref-installer-mac.html

hugo/layouts/shortcodes/ref-installer-win.html

hugo/layouts/shortcodes/ref-tarball.html

hugo/layouts/shortcodes/release-string.html

hugo/static/assets/img/code-snippet.png

hugo/static/assets/img/console.svg

hugo/static/assets/img/github_branches.svg

hugo/static/assets/img/gui.png

hugo/static/assets/img/landing-setup.png

hugo/static/assets/img/mlz-logo.png

hugo/static/assets/img/multilayer.png

hugo/static/assets/img/multiplatform.svg