Updates to improve discoverability of examples

[leggetter]

This repo is mainly used by create-tigris-app, which is fine. However, it does have a bit more potential than that. In this issue, I'd like to propose some changes that:

1. Make the repo more useful standalone
2. Can facilitate improvements in:
   i. create-tigris-app
   ii. the Web Console

General idea (suggestion)

1. Update each example to be an example that doesn't specifically stand out as having to be used with create-tigris-app e.g. rename README-template.md to README.md so the contents is automatically shown when you're in the directory in github.com. And standardize the READMEs a bit more.
2. Utilize package.json to provide more details that can then be used later e.g. description, keywords, human-readable name. We may want to add a new section to allow us to provide more metadata for facet search e.g. Tigris product, framework, use case the example demonstrates, priority (if we feel more are important than others e.g. key frameworks)
3. Upon merging into main, we can have a GitHub action that looks through all the examples and updates a Tigris Search index with all the examples.
4. create-tigris-app and the web console can be updated to query the search index (potentially via a very simple API).

With this approach, we can roll out new examples without the need to update any applications.