Making install commands consistent

The pages under "Integrations" are not consistent. Some say to use NPM, some Yarn, some both, some use quotes around the package name, etc.

docs/react.md

@@ -8,6 +8,8 @@ The Partytown NPM package already comes with a React component, which is a thin
 
 ```bash
 npm install @builder.io/partytown
+yarn add @builder.io/partytown
+pnpm install @builder.io/partytown
 ```
 
 ## Configure

docs/remix.md

@@ -8,6 +8,8 @@ The Remix setup is largely the same as the [React integration guide](/react), ex
 
 ```bash
 npm install @builder.io/partytown
+yarn add @builder.io/partytown
+pnpm install @builder.io/partytown
 ```
 
 ## Configure

docs/shopify-hydrogen.md

@@ -8,6 +8,8 @@ The [Shopify Hydrogen](https://hydrogen.shopify.dev/) setup is largely the same
 
 ```bash
 npm install @builder.io/partytown
+yarn add @builder.io/partytown
+pnpm install @builder.io/partytown
 ```
 
 ## Configure

docs/solid.md

@@ -4,7 +4,13 @@ title: Solid
 
 To setup Partytown in an Solid project take the following steps.
 
-## Installation
+## Install
+
+```bash
+npm install @builder.io/partytown
+yarn add @builder.io/partytown
+pnpm install @builder.io/partytown
+```
 
 Use your favorite package manager to install `@builder.io/partytown` dependency and
 copy the Partytown files to the local filesystem using the Vite plugin.