Update READMEs

webfront/README.md

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+# Webfront
+Running different SBP solvers in the browser using `WASM`.
+
+## Building
+Run `make_wasm.py -r` to compile the library, and put the finished artifacts and related pieces in the `publish` directory.
+
+## Running
+After building, a http server needs to serve the contents. WASM requires this server to serve files ending with `.wasm` as the `application/wasm` MIME type. Python can be utilised with:
+```sh
+python3 -m http.server --directory publish
+```
+A web browser can then be opened on the link suggested.