It should be something like this. Note that I haven't tested it. I have no idea what the lines for WebDAV do.
UrlToolkit {
ToolkitID = pimcore
Method GET Call pimcore_webdav
Method HEAD Call pimcore_webdav
Match ^/plugins/.*/static.* Return
Match ^/.*modules/.*/static.* Return
Match ^/pimcore/static.* Return
Match ^/website/var/(?!tmp|assets|plugins|areas) DenyAccess
Match ^/plugins/.*$ DenyAccess
Match ^/pimcore/.*$ DenyAccess
RequestURI exists Return
Match .* Rewrite /index.php
}
UrlToolkit {
ToolkitID = pimcore_webdav
# === I don't know what these two lines do
RewriteCond %{DOCUMENT_ROOT}/website/var/assets%{REQUEST_URI} -f
RewriteRule ^(.*)$ /website/var/assets%{REQUEST_URI} [PT,L]
# ===
}