docs: copying installation commands made easy

[pranaybajracharya]

Made copy pasting installtion commands easier.

• Removed prompt symbol $ from installation command
• Separated commands for npm, pnpm and yarn

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Sandbox	Source
@tanstack/query-example-react-basic-typescript	Configuration
@tanstack/query-example-solid-basic-typescript	Configuration
@tanstack/query-example-svelte-basic	Configuration
@tanstack/query-example-vue-basic	Configuration

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