Add Stackbit Integration

[RistoBIn]

This pull request add's Stackbit to this Hugo theme. It add's the stackbit.yaml file which makes this theme work with several headless CMS automatically (including Forestry, NetlifyCMS, DatoCMS & Contentful) and it deploys the site to Netlify in 1 click.

You can try it out: https://app.stackbit.com/create?theme=https://github.com/stackbithq/hermit (note the "create with stackbit" button in the readme will import the theme from your repo so until the PR is merged it wont work)

I think this is really valuable and is a very low impact addition on your existing theme structure. Pretty much just the stackbit.yaml file. If you have questions or feedback I'm happy to discuss.

Risto

[RistoBIn]

yes, netlify.toml was modified. Btw, automatic building in netlify will be working. Is that not working?

[Track3]

Although it didn't say build failed, the build command is not correct. as you can see below deploy log, full log can be found here

4:47:59 PM: No build command found, continuing to publishing
4:47:59 PM: Starting to deploy site from ''

This repo use the exampleSite/ folder as Hugo base directory, so theme directory is ../... This is different from a normal hugo site repo (usually uses repo's root as the base dir).

[RistoBIn]

Stackbit system build also based on /example folder. If building is not failed, we may use this netlify.toml. Because, stackbit will occur issue with original netlify.toml. Hope to know your expectation. Thank you.