[📝 Docs]: Fix capitalization consistency in INSTALLATION.md

What Docs changes are you proposing?

Description

Several sentences in INSTALLATION.md start with lowercase letters, which affects the professional appearance and consistency of the documentation.

Location

• File: INSTALLATION.md
• Lines: 223, 229, 237, 243
• Link: https://github.com/json-schema-org/website/blob/main/INSTALLATION.md

Current Issues

The following lines start with lowercase letters:

• Line 223: "you can check code formatting..."
• Line 229: "you can format the code..."
• Line 237: "you can check..."
• Line 243: "you can fix linting issues using..."

Proposed Fix

Capitalize the first letter of each sentence for consistency with standard English grammar and professional documentation practices.

Example

• Before: you can check code formatting...
• After: You can check code formatting...

Additional Context

• Issue type: Documentation / Formatting
• Difficulty: Very Easy
• First contribution: Yes

I would like to work on this issue as my first contribution to the JSON Schema project.
I am ready to work on this issue and submit a PR. Please let me know if I can proceed! 😊

@json-schema-org/docs-team

Code of Conduct

• I agree to follow this project's Code of Conduct

Open INSTALLATION.md and inspect lines 223, 229, 237, and 243, where the issue identifies sentences beginning with lowercase letters. Capitalize those sentence starts and review the diff to confirm that only the four documented wording changes were made.