serve Splide and Three.js locally instead of via CDN

[AritraDey-Dev]

Description

Serve Splide and Three.js locally via static directory to replace external CDN usage. Fixes #9723

Command run to download the css and js file -

curl -L -o static/js/three.min.js https://cdnjs.cloudflare.com/ajax/libs/three.js/r68/three.min.js
curl -L -o static/js/splide.min.js https://cdn.jsdelivr.net/npm/@splidejs/splide@latest/dist/js/splide.min.js && curl -L -o static/css/splide.min.css https://cdn.jsdelivr.net/npm/@splidejs/splide@latest/dist/css/splide.min.css

Reviewers

• [ ] Ambient
• [ ] Docs
• [ ] Installation
• [ ] Networking
• [ ] Performance and Scalability
• [ ] Extensions and Telemetry
• [ ] Security
• [ ] Test and Release
• [ ] User Experience
• [x] Developer Infrastructure
• [ ] Localization/Translation