Monorepo refactor

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#122

Describe what the PR does
Restructures the codebase to be more modular, introducing storybook

State whether the PR is ready for review or whether it needs extra work
still in draft

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I am sold on the storybook, but some things to figure out are, do we really need Lerna?

Argument for removing Lerna in the monorepo setup.

1. npm7 is likely to have workspaces
   Not only npm latest version is head to head with yarn features, but also npm@7, which is predicted for late summer and fall of 2018 is very likely to have Workspaces
   imho lerna is poorly documented, and hard to get up and running with.
   using lerna would also require rest of our team to wrap their heads around that for this specific project, has its not currently part of our stack, and might limit the number of contributions etc.
   It's tempting and common to add a lot of tooling when working with node/js, but most importantly tho, it seems to solve a problem that we don't have for this specific project. Lerna is for managing monorpeos where you publish to npm separate packages to be installed as standalone.
   Eg In our repo we are leaning torwards publishing one package @bbc/react-transcript-editor and letting you import the parts that are needed for your project.
   Which leads me to my second point below.

2. It's possible export various components from the same npm module
   With React Bootstrap for example
   When you install react-bootstrap with npm, if for example you only want a button. doing import Button from 'react-bootstrap/Button'; allows you to only bundle the btn and not the rest of the react-bootstrap library.

You should import individual components like: react-bootstrap/Button rather than the entire library. Doing so pulls in only the specific components that you use, which can significantly reduce the amount of code you end up sending to the client.

3. Lerna requires extra config needed for simple things
   Seems also that Lerna requires extra config for simple things, such as tests. couldn't get the test to work, altho found this article sort of of useful, as tests would need transpiling and jest couldn't find node_modules etc..

Will do a separate spike from this branch/PR to show what it would look like without lerna.