Add webpack 5 demo for asset release

[Copilot]

This PR restructures the repository into an npm-publishable workspaces monorepo for frameworkless theme tokens and split icon assets. It adds package outputs and docs for webpack consumers to import only the icons they use while supporting light/dark theme variables.

Monorepo/workspace foundation
    Added root npm workspace config (packages/*) and root build orchestration.
    Added shared dev dependency (svgo) and repo-level ignore rules for generated/package-manager artifacts.

@solidos/tokens package
    Added packages/tokens/src/themes.css with base semantic tokens and data-theme="light" | "dark" overrides.
    Added package metadata and export mapping for themes.css.
    Added package README with usage and theme-switching guidance.

@solidos/icons package
    Added source split:
        packages/icons/src/icons/ for single-color UI SVGs
        packages/icons/src/logos/ for multi-color logo assets
    Added package metadata with subpath exports for per-file imports:
        @solidos/icons/icons/*
        @solidos/icons/logos/*
    Added package README documenting:
        per-file imports for webpack bundle-size control
        UI icon consumption via CSS mask + --icon-color
        logo consumption via <img>.

Build tooling
    Added minimal Node build scripts:
        tokens: copy src/themes.css to publishable dist/themes.css
        icons: SVGO optimization + emit to dist/icons and dist/logos
            more aggressive pipeline for UI icons
            conservative pipeline for logos.

Repository docs
    Replaced root README content with monorepo/package overview, build instructions, and webpack 5 asset/resource consumer example.

import '@solidos/tokens/themes.css';
import searchIconUrl from '@solidos/icons/icons/search.svg';

const icon = document.createElement('span');
icon.className = 'Icon';
icon.style.setProperty('--icon-mask', url("${searchIconUrl}"));

Original prompt

This pull request was created from Copilot chat.

Adds a working webpack 5 example under examples/webpack-demo/ to demonstrate how consumers bundle @solidos/tokens and @solidos/icons. Also merges the monorepo foundation (packages, build scripts, workspace config) from the sibling PR as the base.

webpack demo (examples/webpack-demo/)

• webpack.config.js — type: 'asset/resource' for SVGs; only imported icons are emitted (tree-shakeable). CSS extracted via mini-css-extract-plugin.
• src/index.js — imports theme tokens + two UI icons + logo; toggles data-theme at runtime.
• public/index.html — includes inline CSS mask styles for icon rendering.
• package.json — uses file: references to local workspace packages (pre-publish compatible).

// webpack.config.js (key rules)
{ test: /\.svg$/i,  type: 'asset/resource' },          // only emits imported SVGs
{ test: /\.css$/i,  use: [MiniCssExtractPlugin.loader, 'css-loader'] }

// src/index.js
import '@solidos/tokens/themes.css';
import searchIconUrl from '@solidos/icons/icons/search.svg'; // only this SVG is emitted

Other

• .gitignore — added examples/*/dist/.
• Root README.md — added "Webpack demo" section pointing to the example.