fix: default color to light mode (#1847)

Defaulting to light mode, which matches our brand colors better. Still
keeping the option for dark mode for people that want it, even though
feels like an old color scheme. replaces #1664

# Checklist:
Remove the checklist to signal you've completed it. Enable auto-merge if
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- [ ] If the pull request requires a cryptography review (e.g.
cryptographic algorithm implementations) I have added the 'crypto' tag.
- [x] I have reviewed my diff in github, line by line and removed
unexpected formatting changes, testing logs, or commented-out code.
- [x] Every change is related to the PR description.
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[linked](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue)
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docs/docusaurus.config.js

@@ -94,7 +94,9 @@ const config = {
         indexName: "aztec",
       },
       colorMode: {
-        respectPrefersColorScheme: true,
+        defaultMode: "light",
+        disableSwitch: false,
+        respectPrefersColorScheme: false,
       },
       docs: {
         sidebar: {