Satyam Bansal

This converts `analytics/activity.js` and `analytics/support.js` to TypeScript. Self-review checklist - [X] [Self-reviewed](https://zulip.readthedocs.io/en/latest/contributing/code-reviewing.html#how-to-review-code) the changes for clarity and maintainability (variable names, code reuse, readability, etc.). Communicate decisions, questions, and potential concerns....

This converts `linkifers.js` to TypeScript. Self-review checklist - [X] [Self-reviewed](https://zulip.readthedocs.io/en/latest/contributing/code-reviewing.html#how-to-review-code) the changes for clarity and maintainability (variable names, code reuse, readability, etc.). Communicate decisions, questions, and potential concerns. - [X]...

This PR basically formats `App.jsx` file to adhere to consistent formatting.