docs(web): document a bit how to deal with frontend

web/README.md

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+# upub-web
+
+this is μpub main frontend: it's a single wasm bundle doing clientside routing for faster navigation between objects
+
+it has the drawback of not being search-engine friendly, but machines should process data for machines themselves (aka: the AP documents), so it's probably fine to have a "js"-heavy frontend
+
+## development
+
+it's probably possible to get `upub-web` to build with just `wasm-bindgen`, but i recommend just using `trunk` to keep your sanity. by default `upub-web` sets the "offline" option, so you'll still need to download `wasm-bindgen` yourself (or run with `TRUNK_OFFLINE=false` and let trunk download it itself once)
+
+```
+$ UPUB_BASE_URL=https://dev.upub.social trunk serve
+```
+
+will give you a local development server with auto-reload pointing to `dev.upub.social`, so you don't even need to spin up a local instance (omit `UPUB_BASE_URL` env variable to make frontend point to localhost instead)
+
+## building
+
+just run
+
+```
+$ trunk build --release
+```
+
+to generate the `./web/dist` folder containing all necessary assets
+
+either serve these yourself, or compile main `upub` with `web` feature enable to have it bundle these freshly built frontend files