Fix some jekyll-remainders

source/tech/2013-12-12-choose-a-vagrant-default-provider.md

@@ -11,13 +11,13 @@ At least that's the case for me.
 
 So if you're annoyed about the Vagrant default behaviour
 
-{% highlight bash %}
+```bash
 $ va status
 Vagrant could not detect VirtualBox! Make sure VirtualBox is properly installed.
 Vagrant uses the `VBoxManage` binary that ships with VirtualBox, and requires
 this to be available on the PATH. If VirtualBox is installed, please find the
 `VBoxManage` binary and add it to the PATH environmental variable.
-{% endhighlight %}
+```
 
 I might be the last one to find out, but there is a Vagrant setting to override
 the default provider: 

source/tech/2014-05-17-checking-ssl-certificates-with-sni.md

@@ -9,11 +9,11 @@ To check the ssl certificate of a site which has
 [SNI](https://en.wikipedia.org/wiki/Server_Name_Indication)
 enabled, just add the -servername parameter to the s\_client:
 
-{% highlight bash %}
+```bash
 $ openssl s\_client -servername site.example.com -connect example.com:443
-{% endhighlight %}
+```
 
 To see only the relevant parts of the certificate – well – grep for it:
-{% highlight bash %}
+```bash
 $ openssl s_client -servername site.example.com -connect example.com:443 2>/dev/null|openssl x509 -text|grep -e "DNS:\|CN="
-{% endhighlight %}
+```