Adding generated resources from resource cache

[deining]

This PR addresses #1444

Without this PR: preview of user guide with regular hugoversion fails:

$ cd userguide && hugo-regular server --themesDir ../..
WARN 2023/02/27 12:33:54 Module "docsy" is not compatible with this Hugo version; run "hugo mod graph" for more information.
Start building sites …
hugo v0.110.0-e32a493b7826d02763c3b79623952e625402b168 windows/amd64 BuildDate=2023-01-17T12:16:09Z VendorInfo=gohugoio
Error: Error building site: TOCSS: failed to transform "scss/main.scss" (text/x-scss). Check your Hugo installation; you need the extended version to build SCSS/SASS with transpiler set to 'libsass'.: this feature is not available in your current Hugo version, see https://goo.gl/YMrWcn for more information
Built in 1150 ms

With this PR in place: preview of user guide with regular hugoversion succeeds:

$ cd userguide && hugo-regular server --themesDir ../..
WARN 2023/02/27 12:34:29 Module "docsy" is not compatible with this Hugo version; run "hugo mod graph" for more information.
Start building sites …
hugo v0.110.0-e32a493b7826d02763c3b79623952e625402b168 windows/amd64 BuildDate=2023-01-17T12:16:09Z VendorInfo=gohugoio

                   | EN
-------------------+-----
  Pages            | 80
  Paginator pages  |  0
  Non-page files   |  8
  Static files     | 38
  Processed images |  5
  Aliases          |  3
  Sitemaps         |  1
  Cleaned          |  0

Built in 618 ms
Watching for changes in C:\path\to\docsy\{assets,i18n,layouts,node_modules,package.json,postcss.config.js,static,userguide}
Watching for config changes in C:\path\to\docsy\userguide\hugo.yaml, C:\Users\adeininger\test-extended-regular\docsy\hugo.yaml
Environment: "development"
Serving pages from memory
Running in Fast Render Mode. For full rebuilds on change: hugo server --disableFastRender
Web Server is available at //localhost:1313/ (bind address 127.0.0.1)
Press Ctrl+C to stop