Swap out primary UI color for Zoo brand blue, add theme color setting to control its hue (#2017)

* Add a setting for themeColor

* Add primary-color to Tailwind, driven by themeColor setting

* Get rid of most uses of "energy" colors

* Change out the rest of the energy colors

* Tweak NetworkHealthIndicator light mode checkmarks

* Handful of other CSS tweaks while I'm here:
- remove the AppHeader bg and border
- pane margins
- better dark mode button styles

* Make Zoo logomark a badge

* A snapshot a day keeps the bugs away! 📷🐛 (OS: ubuntu)

* Re-run CI post-snapshots

* A snapshot a day keeps the bugs away! 📷🐛 (OS: ubuntu)

* Retrigger CI

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

src/routes/Onboarding/Introduction.tsx

@@ -137,7 +137,7 @@ export default function Introduction() {
             alt={APP_NAME}
             className="h-20 max-w-full"
           />
-          <span className="px-3 py-1 text-base rounded-full bg-energy-10 text-energy-80">
+          <span className="px-3 py-1 text-base rounded-full bg-primary/10 text-primary">
             Alpha
           </span>
         </h1>