HDMI pin numbering fixed

HDMI data lines are D0-D2 and not D0-D3.
Correct Pibrella URL
Show asterisk (it's being shown as a bullet)
Add detail about pre-installed package
Improve setBlock documentation
Improve Minecraft usage page
Add screenshots to Minecraft usage page
Reword sentence
Merge pull request #119 from diegoherranz/patch-1

HDMI pin numbering fixed
Add alt text to images to fix the build