Revamp the main index page and templates folder structure

[myanvoos]

This PR overhauls the UI of the main index page and the report's overall styling. It introduces:

• A new nested tables layout with benchmarks now grouped to projects
• Overpass fonts (inspired by the OSV project)
• A consistent global colour theme
• A function to prettify benchmark names i.e. output-hiredis-rediscommandargv now only shows rediscommandargv

It also restructures the template folder, introducing standalone folders for each of the three main pages (index, benchmark, and sample) for better separation of concerns, and modifies the report generation pipeline accordingly.

Previous templates/ structure:

templates/
├─ index.html
├─ benchmark.html
├─ sample.html
├─ base.html
├─ crash.json
└─ index.json

New templates/ structure:

templates/
├── index/
│   ├── index.html
│   ├── index.css
│   └── index.js
├── benchmark/
│   ├── benchmark.html
│   ├── benchmark.css
│   └── benchmark.js
├── sample/
│   ├── sample.html
│   ├── sample.css
│   └── sample.js
├─ base.html
├─ crash.json
└─ index.json

Nested tables preview:

Dependencies introduced: Tailwind, Alpine.js

[oliverchang]

@DavidKorczynski can you help review this?