Change step 5 to 6 and add a new step 5

[jlengstorf]

Change step 5 to 6 and add a new step 5

[jlengstorf]

@luisFilipePT whoops! Thanks for bringing this up — a PR would be extremely welcome, thank you!

@raae while it's not strictly required for development, without adding the theme as a dependency for the demo site this would break when it gets deployed.

[raae]

I run into similar issues if I do a yarn after step 4. I am guessing it then installs the workspace package under the new name and things break.

Theme name should be updated in /theme/package.json, /demo/package.json and /demo/gatsby-config.js.

I am totally new to yarn, but with my little testing it seems the whole "gatsby-theme-jam-example": "*", in /demo/package.json is not needed. Either remove or add renaming to instructions for consistency.