fix: update readme with instructions to use predeployed setup

[snigdha920]

Summary by Sourcery

Documentation:

• Revised the README to guide users through the predeployed setup, making it the primary method for getting started. Added a separate section for customized deployments, outlining prerequisites and steps for deploying contracts and subgraphs.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request updates the README.md file to include instructions for using a predeployed setup, which is the fastest way to get started with the starterkit. It also includes instructions for a customized setup where users can deploy their own contracts, subgraph, and ABIs.

Flow diagram: Setup options decision tree

flowchart TD
    Start[Start] --> Decision{Choose Setup Type}
    Decision -->|Fastest| Predeployed[Predeployed Setup]
    Decision -->|Customizable| Custom[Customized Setup]

    Predeployed --> P1[Install Dependencies]
    P1 --> P2[Login & Connect]
    P2 --> P3[Generate Types]
    P3 --> P4[Start Development]

    Custom --> C1[Install Dependencies]
    C1 --> C2[Login & Connect]
    C2 --> C3[Deploy Contracts]
    C3 --> C4[Deploy Subgraph]
    C4 --> C5[Setup Dapp]
    C5 --> C6[Start Development]

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File-Level Changes

Change	Details	Files
Added instructions for using a predeployed setup.	Added a 'Predeployed Setup' section. Added commands to install dependencies, login, connect to SettleMint, generate types, and start the development server. Added a note to browse to http://localhost:3000 to access the application.	README.md
Updated instructions for a customized setup.	Added a 'Customized Setup' section. Added prerequisites for Forge and Node.js. Added commands to install dependencies, login, connect to SettleMint, deploy contracts, deploy subgraph, setup dapp, and start the development server. Added a note to browse to http://localhost:3000 to access the application. Added a note about replacing the chain ID with the actual chain ID.	README.md
Added a 'Known Limitations & TODOs' section.	Added a section for known limitations and TODOs. Added a note about no CLI command to update ABIs automatically. Added a note about admin account creation relying on first-signup mechanism. Added a note about requiring settlemint connect twice.	README.md

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[sourcery-ai]

Hey @snigdha920 - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Review instructions: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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