Minor docs update

[dennisbrookner]

So far in this PR, I have

• reordered the pages on the website so that the command-line reference comes first
• added a placeholder "coming soon!" tutorial page, where we can add the tutorial in markdown format.

I figure we can leave this PR open while the tutorial continues to take shape.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (6197f3d) 44.12% compared to head (fc7f785) 44.12%. Report is 56 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #36 +/- ## ======================================= Coverage 44.12% 44.12% ======================================= Files 4 4 Lines 281 281 Branches 19 19 ======================================= Hits 124 124 Misses 152 152 Partials 5 5 ``` | [Flag](https://app.codecov.io/gh/rs-station/laue-dials/pull/36/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=rs-station) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/rs-station/laue-dials/pull/36/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=rs-station) | `44.12% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=rs-station#carryforward-flags-in-the-pull-request-comment) to find out more.

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[PrinceWalnut]

I have a couple of edits to make to the notebook based on feedback from Maggie Klureza. I'll make sure to push them by end of week, and perhaps we can include the tutorial into this PR. Let me know if you want to take that on, and what format would be easiest for you to work with @dennisbrookner.