[20] Fix NextJS example "showExperiments" query string and update contributing guide

[TomStrepsil]

Issue

resolves #20

Details

This PR fixes the issue whereby the ?showExperiments querystring handling in the NextJs example is ineffective.

Originally, the NextJs example demonstrated the ssr package, despite this package being superfluous for a platform that has native props-serialization. When an opportunity arose to demonstrate the ssr package elsewhere (made in v0.2.0), the NextJs example was moved to more canonical approach for Next. However, the debug querystring to make the <script type="application/json"> inserted by ssr visible would no longer do anything. This PR fixes that mistake.

Scout Rule:

• Fix typo is JSDoc comment for webpack package
• Add README.mds to NPM packages, so npmjs.com doesn't appear empty
• Tweak the main README.md
• Move the React 17 note in the features package to the tail of the document, near the react-specific store factories
• Update React 17 notes to clarify the alias required for react-dom/server, too
• Update pull_request_template.md to prefix the issue with "resolves " and use hash-shorthand
• Add homepage to package.jsons, again to link to appropriate package from that field on npmjs.com
• Fix some links to the packages from the express examples README.md, which had missed a directory level
• Clarify the need to fork the repository, or get given write access (i.e. ASOS internal), before contributing PRs, as per GitHub documentation:

  If you want to create a new branch for your pull request and do not have write permissions to the repository, you can fork the repository first.

  • May be worth updating the same in @asos/syker, where this file was copied from?

CheckList

• PR starts with [ISSUE_ID].
• Has been tested (where required) before merge to main.