Exclude pages from output during `build` process ("dev only" pages)

[matthew-ia]

Be able to include pages that are dev only, and not output during build.

For example, say I want my project to include some examples, but not be output in my build files. Suppose my project looks like:

• src/
  • pages/
    • examples/
      • example-1.svelte (dev only)
    • index.svelte (actual page for prod)

One solution might be to use a page file prefix that prevents it from being built when mode is 'production'.

Some examples of a prefix could be:

• _example-1.svelte
• .example.svelte (I kinda like this one because it follows the "hidden file" standard and even the editor will make it look like a hidden file)

[matthew-ia]

The main desire here is to be able to include some examples in kit's official source code, but not have them output for every project.

The alternative is to maintain a separate folder of entire kit instances, which sounds like a pain.

I guess another alternative is to allow you to have multiple page directories, and just have the kit instance of the config include a folder like /kit/examples or something