fix: 🐛 page refreshing when not modified

[RobinHeidenis]

This was done by moving to the Last-Modified header in favour of custom behaviour, so the browser now does this automatically for us. In addition, migrated to @vercel/speed-insights, and changed the image size of TMDB poster images to 93 instead of 500 to reduce the amount of data the user has to load, only for us to then shrink it wayyyy down.

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Name	Status	Preview	Comments	Updated (UTC)
bucketlist	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 12, 2023 11:54pm

[what-the-diff[bot]]

PR Summary

• Integration of the @vercel/speed-insights package This PR includes the introduction of a new package, @vercel/speed-insights, which will provide insights about performance to help improve the website's speed. The package details are updated in package.json and pnpm-lock.yaml files.
• Updated styling for multiple UI components Changes have been made in the styling of UI components located in files like CustomDropdown.tsx, DropdownHeader.tsx, ModalHeader.tsx, Navbar.tsx, and NavbarLink.tsx. The changes pertain to the modification of CSS class names to possibly improve the visual appearance and interactivity.
• Change in Image Resolution Updates have been made in PosterImage.tsx and convertImageToHash.ts to reflect changes in image resolution. The image source now points to a lower resolution version, potentially making the page load faster.
• Removal of Unused Files and Code The env.mjs file, which is not used in the project, has been removed. Unused import of WebhookEvent type from createUser.ts file and the unused updatedAt property from the getList query have also been removed to optimize the code.
• Refactoring of Import Statements The import statements in the root.ts file have been reformatted to improve readability and consistency.
• Adjustments in API Response
  In the lists.ts file, changes have been made to the API response, specifically to the getList query. It no longer includes the updatedAt and code properties and a new Last-Modified header has been added to the response. This is likely intended to manage cache behavior based on modified dates.