Add doc to explain nesting stories under titles

[Glazy]

Issue: N/A

What I did

Added a section to the 'Writing Stories' documentation explaining how to nest stories under titles in the Storybook sidebar.

[vercel]

This pull request is automatically deployed with Now.
To access deployments, click Details below or on the icon next to each push.

Latest deployment for this branch: https://monorepo-git-fork-glazy-docs-nesting-under-titles.storybook.now.sh

[shilman]

Thanks @Glazy! Maybe you can also mention that this is configurable using the hierarchyRootSeparator option and link to /configurations/options-parameter docs?

[codecov]

Codecov Report

Merging #6406 into next will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             next    #6406   +/-   ##
=======================================
  Coverage   38.31%   38.31%           
=======================================
  Files         649      649           
  Lines        9857     9857           
  Branches      388      388           
=======================================
  Hits         3777     3777           
  Misses       6020     6020           
  Partials       60       60

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ddecea8...97e67f5. Read the comment docs.

[codecov]

Codecov Report

Merging #6406 into next will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             next    #6406   +/-   ##
=======================================
  Coverage   38.31%   38.31%           
=======================================
  Files         649      649           
  Lines        9857     9857           
  Branches      388      388           
=======================================
  Hits         3777     3777           
  Misses       6020     6020           
  Partials       60       60

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ddecea8...97e67f5. Read the comment docs.

[Glazy]

Awesome idea @shilman 💪My latest commit adds a section that explains this 👍

[shilman]

Boom!!! 💥