resolve package dependency conflicts in sdks/js, README clarifications

[turkycat]

Hey guys, nice work on this project. I'm looking forward to digging deeper!

I found my way here from the 0-to-1 guide on Spark docs and started trying to build things. I had some trouble, but got things working eventually. I took notes of my journey which I'll share below. This PR contains build fixes and suggestions to improve dev workflows on this repo.

If I understand correctly, you guys built some or all of these examples at a hackathon and compiled them together. That's pretty sweet. Lots of good stuff here.

I'm now hacking away with the CLI and express server examples 💪

Notes

These notes may help you understand the path I took to build. If there is anywhere I strayed off the beaten path or you have different advice for this PR or my suggestions, let me know.

Issues I've attempted to resolve are marked with 🟢

• sdks/js/README.md suggests using nvm use || nvm install but there is no .nvmrc file in the sdks/js directory to specify which Node.js version to use. 🟡
• apparently mise solves this for this repo, but it's not clear from the READMEs in these example paths that mise is the primary tool manager for this repo. 🟡 -- I added some text about mise, but NVM use could be clarified if not using mise
• this path is given in https://docs.spark.money/wallet/0-to-1 -- so it should be as simple as the steps given in the docs, but it is not. 🟢
• several package version conflicts due to monorepo structure. 🟢
• mise activation performed with eval "$(mise activate bash)" 🟢
• resolved the package issues with resolutions and upgrades 🟢
• now I need mise? per missing clang in build fail logfile (I assume installing clang locally would resolve) 🟢
• nope, clang not part of mise toml. 🟢
• tried adding clang to mise toml, which -does not- include clang++ and is version 9 (6 years old, oof) -- likely better with system packages anyway 🟢
• installed clang, resolved some system issues (unrelated to mise/spark) 🟢
• also had to yarn build in the sdks/js path -- (spark docs cover this, but not README) 🟢
• a couple endpoints are incorrect in the express example README 🟢

[turkycat]

My fork was out of sync. examples/spark-bare-expo-react-native-app was renamed and the issue I originally had building that was resolved with the recent sync. I've removed my changes to that path as part of the merge.

[turkycat]

github was incorrectly rendering the diff including the package changes from examples/spark-bare-expo-react-native-app. I rebased instead.