🚀 Feature: Update name from "TS" to "TypeScript"

### Bug Report Checklist - [x] I have pulled the latest `main` branch of the repository. - [x] I have [searched for related issues](https://github.com/SquiggleTools/boston-ts-website/issues?q=is%3Aissue) and found none that matched my issue. ### Overview We resolved in an organizing meeting this past week that using the full "TypeScript" is more clear than "TS". "TS" has overlap with some stuff that has nothing to do with JavaScript / TypeScript / web development. ### Additional Info This will involve tweaking font sizing on the heading.