fix: Moved "Return to Regular Route" into root directions list

[hannahpurcell]

The little things I like about this approach is that

• "Return to Regular Route" is put with other directions, which I think it should be!
• The direction is in the root hook instead of scattered in multiple components
• The test for diversionPage now sufficiently covers the check "was 'Return to Regular Route' added to the directions sequence"
• We can still choose to make directions more structured with typing later (per Josh's suggestion)

Also included, updating the Storybook story for this!

[github-actions]

Coverage of commit fc1d9aa

Summary coverage rate:
  lines......: 94.2% (3211 of 3407 lines)
  functions..: 73.7% (1323 of 1795 functions)
  branches...: no data found

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[github-actions]

Coverage of commit fc1d9aa

Summary coverage rate:
  lines......: 94.3% (3212 of 3407 lines)
  functions..: 73.8% (1324 of 1795 functions)
  branches...: no data found

Files changed coverage rate: n/a

Download coverage report

[github-actions]

Coverage of commit 2bfae55

Summary coverage rate:
  lines......: 94.3% (3212 of 3407 lines)
  functions..: 73.8% (1324 of 1795 functions)
  branches...: no data found

Files changed coverage rate: n/a

Download coverage report

[firestack]

Two comments but otherwise this looks good!

didn't mean to approve just yet 😬 and I would like those comments resolved before merging

[joshlarson]

I think it looks good - I made a few non-blocking nits, but the only reason I'm not approving is so that I don't scoop Kayla's review.

[github-actions]

Coverage of commit fb5fea8

Summary coverage rate:
  lines......: 94.2% (3211 of 3407 lines)
  functions..: 73.7% (1323 of 1795 functions)
  branches...: no data found

Files changed coverage rate: n/a

Download coverage report

[firestack]

LGTM, Thanks @hannahpurcell!!