Unused runtime deps: jquery, popper.js, @popperjs/core bloat install

## Problem
`package.json` declares runtime deps that are never imported by source, and ships two conflicting Popper versions.

## Read cite
`package.json` lines 20-25:
```json
"dependencies": {
"@popperjs/core": "^2.11.6",
"bootstrap": "^5.2.3",
"jquery": "^3.6.3",
"popper.js": "^1.16.1",
"vanilla-tilt": "^1.8.0"
}
```

`src/index.js` (full contents) only imports `./scripts/scrollReveal` and `./scripts/tiltAnimation`. `src/index.html` loads a single ``. `src/styles.scss` and `src/sass/vendors/_bootstrap.scss` (`@import "~bootstrap/scss/bootstrap"`) only pull Bootstrap's SCSS — no JS.

## Actual
- `jquery` never imported (Bootstrap 5 does not require it)
- `popper.js@1` is the deprecated v1 name; `@popperjs/core@2` is its successor — both are listed
- Neither Popper package is imported (Bootstrap 5 JS components not used)

## Expected
Remove `jquery`, `popper.js`, and `@popperjs/core` from `dependencies`. Keep only `bootstrap` and `vanilla-tilt`.

## Environment
`bootstrap ^5.2.3`, `parcel ^2.8.2` per `package.json`; README still says "Bootstrap v4.3" (separate doc drift).

Thanks for maintaining cobiwave/simplefolio!