Hide 'Copy to clipboard' on non-code blocks and improvements to Getting Started section (#732)

* [QOL] Hide 'Copy To Clipboard' button on non-code blocks

Sitewide there are multiple code blocks that do not contain
any code in them. But still a `Copy code to clipboard` button
is shown, this patch addresses this issue. It is a QOL improvement
that makes distinguishing code blocks visually easier.

To use this new feature, we need to start our code block like:
```{ .language_name .no-copy }
    ...
    ...
    ...
```

Where language_name is something that can vary (console in our case mostly).
The .no-copy attribute is what disables the function on that particular block.

Signed-off-by: black-dragon74 <niryadav@redhat.com>

* [getting-started] Multiple improvements and cleaner syntax

This is a first of many patches that'll follow for subsequent sections sitewide
which moves OLD md syntax to NEW one and also address any other semantics that come
into notice.

Signed-off-by: black-dragon74 <niryadav@redhat.com>

* Properly annotate code blocks

Signed-off-by: black-dragon74 <niryadav@redhat.com>

* Fix code formatter errors

Signed-off-by: black-dragon74 <niryadav@redhat.com>

Author: black-dragon74

docs/Administrator-Guide/GlusterFS-Introduction.md

@@ -1,30 +1,24 @@
-What is Gluster ?
-=================
+# What is Gluster ?
 
 Gluster is a scalable, distributed file system that aggregates disk storage resources from multiple servers into a single global namespace.
 
 ### Advantages
 
-  * Scales to several petabytes
-  * Handles thousands of clients
-  * POSIX compatible
-  * Uses commodity hardware
-  * Can use any ondisk filesystem that supports extended attributes
-  * Accessible using industry standard protocols like NFS and SMB
-  * Provides replication, quotas, geo-replication, snapshots and bitrot detection
-  * Allows optimization for different workloads
-  * Open Source
-
+- Scales to several petabytes
+- Handles thousands of clients
+- POSIX compatible
+- Uses commodity hardware
+- Can use any ondisk filesystem that supports extended attributes
+- Accessible using industry standard protocols like NFS and SMB
+- Provides replication, quotas, geo-replication, snapshots and bitrot detection
+- Allows optimization for different workloads
+- Open Source
 
 ![640px-glusterfs_architecture](../images/640px-GlusterFS-Architecture.png)
 
-
-
 Enterprises can scale capacity, performance, and availability on demand, with no vendor lock-in, across on-premise, public cloud, and hybrid environments.
 Gluster is used in production at thousands of organisations spanning media, healthcare, government, education, web 2.0, and financial services.
 
-
-
 ### Commercial offerings and support
 
 Several companies offer support or [consulting](https://www.gluster.org/support/).