Reword the introduction

The use of parenthesis was a little excessive, and it didn't emphasis
the importance of flexibility.

index.xhtml

@@ -11,9 +11,8 @@
         <section>
             <h2>Introduction</h2>
             <p>
-                Limnoria is a Python IRC bot that is robust (it doesn’t crash),
-                user friendly (it’s easy to configure),
-                and programmer friendly (plugins are extremely easy to write).
+                Limnoria is a multipurpose Python IRC bot, designed for flexibility and robustness,
+                while being easy to install, set up, and maintain.
             </p>
             <p>
                 It aims to be an adequate replacement for most existing IRC bots.
@@ -27,7 +26,8 @@
             </p>
 
             <p>
-                There are also dozens of third-party <a href="./plugins.xhtml">plugins</a>,
+                There are also dozens of third-party <a href="./plugins.xhtml">plugins</a>
+                written by dozens of independent developers,
                 and it is very easy to
                 <a href="https://docs.limnoria.net/develop/plugin_tutorial.html">write your own</a>
                 with only basic knowledge of Python.