Make api key error message better (#10)

<img width="679" alt="Screenshot 2024-03-01 at 6 29 05 PM"
src="https://github.com/autoblocksai/cli/assets/7498009/b644078d-6de2-43d2-a04c-9333f6e1b197">

src/cli.ts

@@ -39,6 +39,15 @@ async function latestVersionMiddleware(): Promise<void> {
  }
 }
 
+// The newline at the top of this message is intentional;
+// it gives separation between the error message shown by
+// yargs and this one.
+const apiKeyMissingErrorMessage = `
+Autoblocks API key is required.
+Provide it via the AUTOBLOCKS_API_KEY environment variable or the --api-key option.
+
+You can get your API key from https://app.autoblocks.ai/settings/api-keys`;
+
 const parser = yargs(hideBin(process.argv))
  .command(
  'testing exec',
@@ -50,7 +59,6 @@ const parser = yargs(hideBin(process.argv))
  'Autoblocks API key. Can be set via the AUTOBLOCKS_API_KEY environment variable.',
  type: 'string',
  default: process.env.AUTOBLOCKS_API_KEY,
- demandOption: true,
  })
  .option('message', {
  alias: 'm',
@@ -68,6 +76,7 @@ const parser = yargs(hideBin(process.argv))
  type: 'boolean',
  default: false,
  })
+ .demandOption('api-key', apiKeyMissingErrorMessage)
  .help();
  },
  (argv) => {