Restructure and add quickstart to docs

docs/cli/reference/commands.mdx

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+---
+title: "Commands"
+---
+
+## Commands
+
+| Command | Description                                                          |
+| ------- | -------------------------------------------------------------------- |
+| `login` | Used to authenticate and set the logged in user.                     |
+| `init`  | Used to link a local project to the platform.                        |
+| `run`   | Used to inject envars from the platform into an application process. |
+
+## Global options
+
+| Option            | Description                                     |
+| ----------------- | ----------------------------------------------- |
+| `--help`, `-h`    | List help for any command                       |
+| `--debug`, `-d`   | Enable verbose logging                          |
+| `--domain`        | Use to direct Infisical to a self-hosted domain |
+| `--version`, `-v` | Print version information and quit              |

docs/cli/reference/init.mdx

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+---
+title: "infisical init"
+---
+
+```bash
+infisical init
+```
+
+## Description
+
+Link a local project to the platform
+
+The command creates a `infisical.json` file containing your Project ID.

docs/cli/reference/login.mdx

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+---
+title: "infisical login"
+---
+
+```bash
+infisical login
+```
+
+## Description
+
+Verify a user and save credentials to the system keyring.
+
+To change the logged in user, run the command again to overwrite the previous login.

docs/cli/reference/run.mdx

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+---
+title: "infisical run"
+---
+
+```bash
+infisical run [options] -- [your application start command]
+```
+
+## Description
+
+Inject environment variables from the platform into an application process.
+
+## Options
+
+| Option        | Description                                                                                                 | Default value |
+| ------------- | ----------------------------------------------------------------------------------------------------------- | ------------- |
+| `--env`       | Used to set the environment that secrets are pulled from. Accepted values: `dev`, `staging`, `test`, `prod` | `dev`         |
+| `--projectId` | Used to link a local project to the platform (required only if injecting via the service token method)      | `None`        |