Integrate rich text/media for better UX

[cedricwaxwing]

Is your feature request related to a problem? Please describe.
Currently, the user must write their article in markdown, and they also must provide their own link for images. This is a major barrier for many users.

Describe the solution you'd like
A simple rich text editor that directly uploads media to ipfs for the user when the article is published.

Additional context
I've mapped out a lot of this flow here:
https://www.figma.com/file/IaimIfw2pXyR9PlQqdo6M2/Tabula?node-id=1116%3A2197&t=3pePjWqFfpRtjSiF-1

Here's a quick example of what the rich editor might look like:

I'd recommend we use an existing library to handle the rich text. Something like this (or similar) would work great: https://github.com/JefMari/awesome-wysiwyg#for-react

[juliopavila]

covered #228