📖 Revert back to Markdown syntax

Turn images in markdown syntax since GitHub doesn't support CSS
overrides anyway

README.md

@@ -1,6 +1,4 @@
-<p style="text-align: center;">
-    <img src="https://raw.github.com/JacoBits/piano/master/images/logos/logo128.png" alt="Piano icon" />
-</p>
+# ![Piano icon](https://raw.github.com/JacoBits/piano/master/images/logos/logo32.png) Piano
 
 Piano is a desktop app that uses built-in MIDI support in order to
 offer an usable interface for playing any of the 127 instruments defined
@@ -8,7 +6,7 @@ by General MIDI.
 
 [Download latest release](https://github.com/JacoBits/piano/releases)
 
-# Building
+## Building
 
 Using Grunt:
 
@@ -19,48 +17,45 @@ $ grunt build:win   # use build:linux or build:mac for other systems
 
 Then run the app in `build/win` folder.
 
-# Screenshots
+## Screenshots
 
-<p style="text-align: center;">
-    <img src="https://raw.github.com/JacoBits/piano/master/images/screenshots/main.png" alt="Main window" />
-    *Main window*
-</p>
+![Main window](https://raw.github.com/JacoBits/piano/master/images/screenshots/main.png)
 
-<p style="text-align: center;">
-    <img src="https://raw.github.com/JacoBits/piano/master/images/screenshots/music.png" alt="With a music loaded" />
-    *With a music loaded*
-</p>
+*Main window*
 
-<p style="text-align: center;">
-    <img src="https://raw.github.com/JacoBits/piano/master/images/screenshots/instruments.png" alt="Instruments window" />
-    *Instruments window*
-</p>
+![With a music loaded](https://raw.github.com/JacoBits/piano/master/images/screenshots/music.png)
 
-# Known issues
+*With a music loaded*
 
-## Pre-release
+![Instruments window](https://raw.github.com/JacoBits/piano/master/images/screenshots/instruments.png)
+
+*Instruments window*
+
+## Known issues
+
+### Pre-release
 
 This app is currently in pre-release state, which means it isn't stable
 and that all work you have done might be lost at any time.
 
 If you find any bug or have any improvement idea, please fill an issue.
 
-## Languages
+### Languages
 
 Currently, the app is only available in French. New languages will be
 added soon.
 
-## MIDI support
+### MIDI support
 
 The app won't produce any sound on systems that doesn't have at least one
 bundled MIDI output. Maybe should we ship with a default synthetiser.
 
-## Linux/Mac
+### Linux/Mac
 
 The app has not yet been tested on Linux and Mac. If you encounter any
 problem, please fill an issue.
 
-# Credits
+## Credits
 
 Icons made by: