Improve chrome extension readme

[jul-sh]

Checklist

• Pull request affects core Oak functionality (e.g. runtime, SDK, ABI)
  • I have written tests that cover the code changes.
  • I have checked that these tests are run by
    Cloudbuild
  • I have updated documentation accordingly.
  • I have raised an issue to
    cover any TODOs and/or unfinished work.
• Pull request includes prototype/experimental work that is under
  construction.

[github-actions]

Reproducibility Index:

6fb298fea6891361e1636673263cdb6175f01c580b56b7fff730bf30e839a7c4  ./examples/abitest/bin/abitest_0_frontend.wasm
ef633a8cf2decfa4c8deb50c0bb884b590afab1a279074cac7e872c6e781cf9c  ./examples/abitest/bin/abitest_1_backend.wasm
b5b6e65fe304cca307ec9c9af3b6753e615637699261905ac9b3eec5cbda372f  ./examples/aggregator/bin/aggregator.wasm
7e71d7195e131a22c047abc704fb3322bc3918acbc1c191fb99dc6bc811f33f2  ./examples/chat/bin/chat.wasm
7a251ede64220677f33cc6d8e1f4cde6dab00ef69627a96ced1ecdc0ab8d9143  ./examples/hello_world/bin/hello_world.wasm
43f8b41042ce37ef38ffe8f610e145c6ad3bad0b70f7dc967a163aef42e98b0f  ./examples/hello_world/bin/translator.wasm
8c2cda21ece8cb306999243c3dd8a6d4a96e5e5d3388b9d6fb07f6e74d721d61  ./examples/http_server/bin/http_server.wasm
d2da69f21fa2603368de037b28bd5e4c934c1f6661fd6deed89f181221bdcccb  ./examples/injection/bin/injection.wasm
dbb8fea6c498b154fb70593f986e5d7ffbf0c4f6451ab4485b4dbe644e03a388  ./examples/private_set_intersection/bin/private_set_intersection.wasm
7c7615ca42a375dc6eef52315a5bc8b592b24c8335a85bb80531b8c5ab0efb20  ./examples/private_set_intersection/bin/private_set_intersection_handler.wasm
43f8b41042ce37ef38ffe8f610e145c6ad3bad0b70f7dc967a163aef42e98b0f  ./examples/translator/bin/translator.wasm
3dd7d0a612f56bcd2c3bb72a966f9e37aef297bb85f610b4ed843c0da0ef6d97  ./examples/trusted_database/bin/trusted_database.wasm
497f0c47667e0e84d51d81cc63cf5ff768672f0e075375dc1c23149a28ff500c  ./oak_loader/bin/oak_loader

Reproducibility Index diff: