ENG-1569 Chore: Setup env variable files (#51)

## Affected Packages

Apps

- [x] portal

Packages

- [x] 1ui
- [x] api
- [x] protocol
- [x] sdk

Tools

- [ ] tools

## Overview

Setups env variables file for each app/package. These variables will be
the source of truth for build time configurations for local, test, and
production. This will enable us to build the app in different
environments but all off the `main` branch.

`.env.example` is a shell of the 3 environment configurations and should
always have all the possible ENV variables. The 3 configurations are as
follows:

- `.env.local`
- `.env.test`
- `.env.production`

@jonathanprozzi would love your help with populating the `.env.example`
files with the relevant variables.

## Build time logic

<img width="923" alt="image"
src="https://github.com/0xIntuition/intuition-ts/assets/37151383/35d3b616-92b7-4f32-bfd1-613fa40f9575">

## Declaration

- [ ] I hereby declare that I have abided by the rules and regulations
as outlined in the
[CONTRIBUTING.md](https://github.com/0xIntuition/intuition-ts/blob/main/CONTRIBUTING.md)

.gitignore

@@ -5,4 +5,7 @@ out/
 dist/
 
 .nx/cache
-packages/1ui/storybook-static
+packages/1ui/storybook-static
+
+.env*
+!.env.example

README.md

@@ -41,6 +41,14 @@ Each package will have more detailed instructions, but you should clone the enti
 - Clone the monorepo from the root: `[email protected]:0xIntuition/intuition-ts.git`
 - Follow individual instructions for each app and package
 
+### Environment variables
+
+Please read [Nx's env variable definition guide](https://nx.dev/recipes/tips-n-tricks/define-environment-variables) to see how we organize our env variables. Each app/package will have the following files that reflects the three configurations we have.
+
+- .env.local
+- .env.test
+- .env.production
+
 ## Contributing
 
 Please read the [contributing guide](./CONTRIBUTING.md).