Add per-instance configs (#165)

[mykhailodanilenko]

🚀 Description

This PR changes the featured instances file from .json to .json5; adds customizations to instance info in the file, allowing for greater control over featured instance display; adds a unit test that validates the file to conform to the specified schema to prevent breaking changes to the config. Available at https://mykhailodanilenko.github.io/web-client/. Also, moved the Swebbtv instance higher on the list.

📄 Motivation and Context

#165

🧪 How Has This Been Tested?

Web and mobile

📦 Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

✅ Checklist (copied from README)

• Squash your changes into a single clear and thoroughly descriptive commit, split changes into multiple commits only when it contributes to readability
• Reference the GitHub issue that you are contributing on in your commit title or body
• Sign your commits, as this is required by the automated GitHub PR checks
• Ensure that the changes adhere to the project code style and formatting rules by running npx eslint . and npx prettier --check ../ from the ./OwnTube.tv/ directory (without errors/warnings)
• Include links and illustrations in your pull request to make it easy to review
• Request a review by @mykhailodanilenko, @ar9708 and @mblomdahl

[mblomdahl]

I've added the concerns I had with async loading to the backlog as #179 after another round of trying all the strategies in JSON5 documentation, so let's revisit this "later". 🙃