Webpack hot reloading examples

[Konstiman]

On the npm run, the whole Headstart folder was served as static, which caused a reload on any file change.

This issue has started happening with the new Webpack - it was either a mistake I made during the migration, or the new Webpack simply doesn't ignore changes on some static-served files, such as .git.

I fixed that by setting only the examples/ folder as static.

This change doesn't have any impact on the deployment - it affects purely the npm run local server.

For the local server, it has one consequence: the local examples are now served on the following adresses:

http://localhost:8080/local_files/
http://localhost:8080/local_streamgraph/
http://localhost:8080/project_website/base.html
http://localhost:8080/project_website/pubmed.html

I added this to the READMEs.

In the main README, I also updated the info about required node and npm versions to match our recent decisions.

And finally, I added myself to the project authors in the main README - or at least I hope I belong there too...? 😄