write some docs and fixup demo

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+Plugins
+=======
+
+The plugins currently available in the standard distribution of Image LightBox are the following.
+
+ActivityIndicator
+    Displays an indicator when images are loading.
+
+Overlay
+    Overlays the page with a semitransparent layer when images are displayed.
+
+CloseButton
+    Displays a button in the top right corner that one should press to exit the lightbox
+
+Captions
+    Assuming a gallery of images with markup such as bellow, the `alt`  attribute of the `img` tag will be used for caption of the image.
+
+     .. code-block:: html
+
+        <a href="https://example.com/image.jpg"  data-imagelightbox="0">
+            <img src="https://example.com/image.jpg" alt="My Caption">
+        </a>
+
+Navigation
+    Displays navigation dots that can be used to jump between images.