docs: add thoughts on future design

[codecov[bot]]

Codecov Report

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

Project coverage is 96.03%. Comparing base (4685789) to head (7a681d0).

:exclamation: Current head 7a681d0 differs from pull request most recent head 0683f3d

Please upload reports for the commit 0683f3d to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #157 +/- ## ========================================== - Coverage 96.27% 96.03% -0.24% ========================================== Files 28 20 -8 Lines 3191 2898 -293 ========================================== - Hits 3072 2783 -289 + Misses 119 115 -4 ``` | [Flag](https://app.codecov.io/gh/shorebirdtech/updater/pull/157/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=shorebirdtech) | Coverage Δ | | |---|---|---| | [patch](https://app.codecov.io/gh/shorebirdtech/updater/pull/157/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=shorebirdtech) | `36.26% <ø> (ø)` | | | [updater_tools](https://app.codecov.io/gh/shorebirdtech/updater/pull/157/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=shorebirdtech) | `?` | | 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=shorebirdtech#carryforward-flags-in-the-pull-request-comment) to find out more.

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