fix(codepens): using unicode characters to avoid codepen's unescaping
fix(codepens): using unicode characters to avoid codepen's unescaping

- Codepen was unescaping &lt; (<) and &gt; (>) which caused, on some demos, an unclosed elements (like `<md-select>`).
Used different unicode lookalike characters so it won't be considered as an element

fixes #8761

Closes #9314

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