Additional clarity on documentation

[atgao]

Thank you for writing up the docs. Overall they're quite easy to follow for someone with minimal experience with node/handlebars. I do wish there was additional clarification or repetition of some of these points while I was making my study:

1. Knowing to rerun npm run build and npm run devserver each time I made changes to my study (vs npm run develop). Having this instruction explicitly stated in either step 4 or 5 would be helpful
2. When adding a new page, I think it should be explicitly stated that the timeline.push is what adds a page to the current study.
3. Knowing to change the study's metadata in index.html