add support to abbreviations, definition lists and subscript/superscript text

[daiyam]

This change adds support of:

• abbreviations
• subscript text
• superscript text
• definition lists (allow empty definition)

[Rokt33r]

@daiyam Could you resolve the conflicts?

[daiyam]

@Rokt33r I've resolved the conflicts

[Rokt33r]

@daiyam Could you fix the conflicts again? I'm sorry for being late.. 😢

[daiyam]

@Rokt33r I've made the merge but I wasn't able to test. On the master, when I do yarn dev, I'm getting Electron: bad option: --hot out of the blue... or on an older version, it doesn't start...
I've broken something on my machine...

[Rokt33r]

@daiyam Could you try to remove node_modules and execute yarn again? Btw, I'll test it by myself. :)

[daiyam]

@Rokt33r I did tried, even removing yarn and electron caches. But then, I remembered, I've install some Python scripts. Not sure, what was the problem, but it was fixed after a reboot... 😔

I've made a small change in the styl file.

[Rokt33r]

Okay! And I've tested this now. It looks Awesome! 💯