docs: update installation and env variable docs for Polykey CLI refresh

Author: xrissoula

docs/Getting-Started/polykey-cli/installation.md

@@ -6,7 +6,9 @@ Installing the CLI can be done in different ways depending on your operating
 environment.
 
 :::info
+## Polykey Core Overview
 
+The Polykey CLI and core primarily use TypeScript for service logic, domain business operations, and persistence layers. While the main codebase is in TypeScript, some supporting libraries incorporate native C++ or Rust for platform‐specific functionality. This approach combines cross‐platform convenience with native performance optimizations.
 Polykey-CLI has only been tested on Linux and macOS. We are working on
 supporting other platforms. There's minor teething problems when it comes
 supporting other platforms. Help us by reporting any issues with the CLI tool in
@@ -441,7 +443,7 @@ The CLI is published as
 Install it with:
 
 ```sh
-npm install -g polykey-cli
+npm install polykey
 ```
 
 This will install the Polykey-CLI into the path pointed to by the command

docs/Getting-Started/polykey-cli/using-environment-variables.md

@@ -59,13 +59,19 @@ application, you can output them in different formats.
 #### Unix-like Systems Example
 
 ```bash
-polykey secrets env --env-format unix --env Weather-Ops:API_KEY
+olykey secrets env --env-format unix --env MyVault:API_KEY
+
+API_KEY=someRandomValue123
 ```
 
 #### JSON Format Example
 
 ```bash
-polykey secrets env --env-format json --env Weather-Ops:API_KEY
+polykey secrets env --env-format json --env MyVault:API_KEY
+
+{
+  "API_KEY": "someRandomValue123"
+}
 ```
 
 These commands display the environment variables in the console, useful for
@@ -99,7 +105,8 @@ secrets.
 #### AWS CLI Integration Example
 
 ```bash
-polykey secrets env --env AWS-Creds:AWS_ACCESS_KEY_ID,AWS-Creds:AWS_SECRET_ACCESS_KEY -- aws s3 ls
+polykey secrets env \
+  $ polykey secrets env aws-creds:AWS_ACCESS_KEY_ID aws-creds:AWS_SECRET_ACCESS_KEY -- aws s3 ls
 ```
 
 This securely passes AWS credentials to the AWS CLI.