Update Wiki / Readme with full instructions on how to build and run the SPARC app?

[agarny]

I am on macOS and my computer wasn't set up to run the SPARC app. In other words, yarn install followed by yarn dev didn't cut it for me.

Instead, I had to do the following:

• Install nvm (see https://github.com/nvm-sh/nvm), e.g.

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.37.0/install.sh | bash

• Install node.js 12.13.0:

nvm install v12.13.0

• Install Yarn (see https://classic.yarnpkg.com/en/docs/install/), e.g.

curl -o- -L https://yarnpkg.com/install.sh | bash

• Export some environment variables:

export KNOWLEDGEBASE_KEY=<KNOWLEDGEBASE_KEY>
export BLACKFYNN_API_HOST=<BLACKFYNN_API_HOST>
export BLACKFYNN_API_SECRET=<BLACKFYNN_API_SECRET>
export BLACKFYNN_API_TOKEN=<BLACKFYNN_API_TOKEN>
export CTF_SPACE_ID=<CTF_SPACE_ID>
export CTF_CDA_ACCESS_TOKEN=<CTF_CDA_ACCESS_TOKEN>
export CTF_API_HOST=<CTF_API_HOST>
export DEPLOY_ENV=<DEPLOY_ENV>

• Clone the SPARC App from https://github.com/ABI-Software/sparc-app.git and cd to it:

git clone https://github.com/nih-sparc/sparc-app.git
cd sparc-app

• Install the SPARC App's dependencies:

yarn install         <-- Results in quite a few warnings that probably ought to be addressed

• Serve the SPARC App with hot reload at http://localhost:3000/:

yarn dev             <-- Results in a warning about the mode option being deprecated