Use meson to build the themes subproject

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+# Themes
+This subproject provides themes for the website.
+
+## Prerequisites
+
+- Emscripten SDK (emsdk)
+- Meson build system (`pip install meson` or via your package manager)
+- Ninja build backend (usually installed with Meson)
+
+## Building
+
+### Initial Setup
+
+```bash
+meson setup builddir --cross-file emscripten.ini
+```
+
+### Compile
+
+```bash
+meson compile -C builddir
+```
+
+The output files will be automatically copied to:
+- `dist/output.js`
+- `dist/output.wasm`
+
+The original build artifacts are also available in `builddir/` if needed.
+
+### Clean Build
+
+```bash
+# Clean and rebuild
+meson compile -C builddir --clean
+meson compile -C builddir
+```
+
+### Complete Clean
+
+```bash
+# Remove the build directory entirely
+rm -rf builddir
+```
+
+## Build Options
+
+You can configure build options during setup:
+
+```bash
+# Debug build
+meson setup builddir --cross-file emscripten.ini --buildtype=debug
+
+# Release build with optimizations
+meson setup builddir --cross-file emescripten.ini --buildtype=release
+
+# Reconfigure an existing build
+meson configure builddir --buildtype=debug
+```