Update index.rst

Remove pointless sentence.

Author: bmunkholm

docs/install/index.rst

@@ -8,10 +8,6 @@ This section of the documentation covers the installation of CrateDB on differen
 kinds of operating systems and environments, both suitable for on-premises and
 development sandbox operations.
 
-The first step to using any software package is getting it properly installed.
-Please read this section carefully.
-
-
 .. toctree::
     :maxdepth: 3
     :hidden: