Feature/issue 1116 base path configuration

[thescientist13]

Related Issue

resolves #1116 (and #273)

Summary of Changes

1. Add basePath support to greenwood.config.js (covers pages, API routes, and adapter routing, <script> and <link> tags, and GraphQL queries)
2. Persist base path setting in a <script> tag
3. Add Base Path configuration docs
4. Update GitHub Pages guide to call out when to use a base path

TODO

1. [x] Enable for greenwood build / greenwood serve
2. [x] Support script and style tags
3. [x] Check support for /graph.json
4. [x] Check support for static router
5. [x] Check support for 404 page
6. [x] Odd margin: auto and navigation issues on the docs website
7. [x] Should this be baked into the graph / URLs by default?
8. [x] Add test cases
   • develop
   • serve
   • graphql
   • static router
9. [x] finish and add test cases for - https://github.com/ProjectEvergreen/greenwood/issues/273
10. [x] Check support for dev proxy
11. [x] Check support for API routes / SSR pages
12. [x] Check support in adapters (for host routing)
13. [x] Display basePath for server logging output
14. [x] Add documentation
    • clarify this is only for greenwood routing (not for user content like links, forms, etc)
15. [x] test with a project using GitHub pages and update GitHub pages guide - https://github.com/ProjectEvergreen/greenwood-demo-github-pages/issues/1
16. [x] "lift" shared client side base path config to CLI output and document - https://github.com/thescientist13/greenwood-starter-presentation/pull/66
17. [x] Remove demo code
18. [x] Refactor tests to align with #1172

Questions

1. [x] Is there actually a way to do it with just <base href="..."/> (make discussion) - https://github.com/ProjectEvergreen/greenwood/discussions/1175
2. [x] should track an issue for customizing trailing forward slash - https://github.com/ProjectEvergreen/greenwood/issues/new