Make the help link more prominent

Make the help link more prominent by increasing the font size and
written out fully rather than just a quotation mark.
Improve description in help

Provide better description of how the IME is to be used.
Fix description of tonal marks in help

Include the neutral tonal mark (key '5') in help for Pinyin.
Color links dark blue

Make the color of links dark blue, to differentiate it from regular
text.