fix(md-theme) add missing literal slashes to themeNameRegex
fix(md-theme) add missing literal slashes to themeNameRegex

`.` in regex strings means any character. We want to search for the literal `.`

Closes #8871

gkalpak/material,profoundry-us/material,gkalpak/material,Splaktar/material,j3ski/material,ilovett/material,hayloft/material,marekmicek/material,ilovett/material,pwistbac/material,miguelcobain/material,bluebirdtech/material,vertazzar/material,imjoeco/material,SamDLT/material,angular/material,clshortfuse/material,welkinhealth/material,hayloft/material,marekmicek/material,crisbeto/material,pwistbac/material,j3ski/material,angular/material,ServiceManagementGroup/material,SamDLT/material,clshortfuse/material,profoundry-us/material,clshortfuse/material,j3ski/material,Frank3K/material,Splaktar/material,vertazzar/material,bluebirdtech/material,crisbeto/material,vertazzar/material,graingert/material,Splaktar/material,angular/material,daniel-nagy/material,miguelcobain/material,marekmicek/material,oostmeijer/material,graingert/material,daniel-nagy/material,ServiceManagementGroup/material,imjoeco/material,oostmeijer/material,welkinhealth/material,david-gang/material,ilovett/material,oostmeijer/material,SamDLT/material,clshortfuse/material,bluebirdtech/material,j3ski/material,marekmicek/material,david-gang/material,graingert/material,oostmeijer/material,angular/material,crisbeto/material,crisbeto/material,imjoeco/material,profoundry-us/material,graingert/material,gkalpak/material,daniel-nagy/material,DevVersion/material,DevVersion/material,ServiceManagementGroup/material,ServiceManagementGroup/material,imjoeco/material,Splaktar/material,david-gang/material,Frank3K/material,hayloft/material,welkinhealth/material,ilovett/material,miguelcobain/material,gkalpak/material,hayloft/material,DevVersion/material,Frank3K/material,profoundry-us/material,david-gang/material,SamDLT/material,miguelcobain/material,pwistbac/material,bluebirdtech/material,DevVersion/material,Frank3K/material,daniel-nagy/material,vertazzar/material,pwistbac/material,welkinhealth/material