Update yew-router examples, make them easier to run

[philip-peterson]

Description

Tries to make the yew-router examples more self-explanatory, easier to run by adding a run.sh in each example which launches a simple Python server. Also noticed that cargo web seems to not be working these days, so replaced those instructions with wasm-pack.

Checklist:

• I have run ./ci/run_stable_checks.sh
• I have reviewed my own code
• [NA] I have added tests

[philip-peterson]

Reason I renamed this is to make it stand out; static when it's sorted alphabetically with the rest of the examples, looks like it's the name of an example.

[teymour-aldridge]

Suggested change

	In applicable directories, launch the `run.sh` shell script.
	In applicable directories, run the `run.sh` shell script.

[teymour-aldridge]

Suggested change

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[philip-peterson]

@teymour-aldridge thanks for the quick review!

[teymour-aldridge]

No problem! One thing is that wasm-pack won't work if the examples in question use stdweb.

[teymour-aldridge]

I now see why the examples aren't working with cargo web – it's because they're using yew with web_sys (which is the new default) rather than stdweb (which used to, but is no longer, the default). cargo web is specific to stdweb and doesn't work with web_sys.

[philip-peterson]

Ahh okay. Maybe we can update that again down the road? For the record, this is the error message:

Error loading Rust wasm module 'minimal_router': TypeError: "import object field '__wbindgen_placeholder__' is not an Object"

[teymour-aldridge]

That's a lovely error message!
We moved away from stdweb because it hasn't had any development activity in over half a year and I therefore doubt that we're going to move back to it (because maintaining a fork would consume a lot of project bandwidth and web_sys is supported by the rustwasm working group).

[philip-peterson]

That makes sense. Do we still need features = ["web_sys"]? It is a default feature, although we have default-features = false specified sometimes for some reason.

[hgzimmerman]

The #[default-features = false] is there to drive the point home that you don't need all the features enabled if you don't intend to use them (minimal and switch) example.

Come to think of it, the switch example really isn't an example and is more of a mediocre/manual test suite. Its not meant to be ran in the browser.
I think it should be converted into a test/ directory instead - but that's outside of the scope of this PR.

@teymour-aldridge Are tests for this project expected to be ran with cargo-web still? I'm under the impression that there has been an effort to migrate them to use something else, but I haven't followed that development super closely.

Pull request has been modified.

[jstarry]

Closed in favour of #1559