rewriteengine on
rewritecond %{http_host} ^https://mx-blind.com
rewriterule ^(.*)$ https://mx-blind.com/vb/$1 [r=permanent,l]

rewriteengine on
rewritebase /
rewritecond %{http_host} ^blog.mx-blind\.com$ [nc]
rewriterule ^(.*)$ https://mx-blind.com/$1 [r=301,l]