feat(border_color): add border_color customization option and update examples

[Ashutosh00710]

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Project	Deployment	Preview	Comments	Updated (UTC)
github-readme-activity-graph-oyjj	Ready	Preview	Comment	Sep 6, 2025 6:12pm

[Copilot]

Pull Request Overview

This PR adds a new border_color customization option to the GitHub Activity Graph, allowing users to specify a custom border color for their contribution graphs instead of relying solely on the existing hide_border option.

• Adds border_color query parameter support for custom border color specification
• Updates the border color logic to prioritize custom color over hide_border setting
• Adds comprehensive test coverage and documentation for the new feature

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/interfaces/interface.ts	Adds border_color property to ParsedQs interface
src/utils.ts	Updates border color logic to check for custom border_color before hide_border
src/svgs.ts	Fixes trailing comma syntax
src/handlers.ts	Fixes trailing comma syntax
src/GraphCards.ts	Fixes trailing comma syntax
test/svgs.test.ts	Fixes trailing comma syntax
test/mockFunctions.ts	Fixes trailing comma syntax
test/fakeInputs.ts	Adds test data for border_color feature
README.md	Documents the new border_color parameter and updates example

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