docs: add "Things about PHP" slides

things-to-know-php/sections/introduction.rst

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+.. page:: imagePage
+
+.. image:: images/php-logo.png
+   :width: 15cm
+
+.. raw:: pdf
+
+    TextAnnotation "Working with PHP and Drupal since 2007 as a hobbyist and Freelancer, full-time since 2010."
+    TextAnnotation "Currently working as a Lead Developer at Transport for Wales."
+
+.. page:: standardPage
+
+elePHPants!
+===========
+
+.. image:: images/elephpants.jpg
+   :width: 23cm
+
+.. page:: standardPage
+
+What is PHP?
+============
+
+PHP is a popular general-purpose scripting language that is especially suited to web development.
+
+|
+
+Fast, flexible and pragmatic, PHP powers everything from your blog to the most popular websites in the world.
+
+|
+
+http://php.net
+
+.. raw:: pdf
+
+    TextAnnotation "First released in 2005, most recent release (8.1.3) on 17th February 2022."
+
+.. page:: titlePage
+
+.. class:: centredTitle
+
+Personal Home Page
+
+.. page::
+
+.. class:: centredTitle
+
+PHP: Hypertext Preprocessor
+
+|
+
+.. class:: centred
+
+(recursive acronym)
+
+.. page:: imagePage
+
+.. image:: images/php-versions.png
+   :width: 25cm
+
+.. page::
+
+.. image:: images/server-side-languages.png
+   :width: 25cm
+
+.. page::
+
+.. image:: images/content-management-systems.png
+   :width: 25cm