chore(docs): add math, regex modules to the docs (#4227)

I noticed the `math` and `regex` modules did not appear on our docs, so I added them.

Fixes #4226

## Checklist

- [x] Title matches [Winglang's style guide](https://www.winglang.io/contributing/start-here/pull_requests#how-are-pull-request-titles-formatted)
- [x] Description explains motivation and solution
- [ ] Tests added (always)
- [x] Docs updated (only required for features)
- [ ] Added `pr/e2e-full` label if this feature requires end-to-end testing

*By submitting this pull request, I confirm that my contribution is made under the terms of the [Wing Cloud Contribution License](https://github.com/winglang/wing/blob/main/CONTRIBUTION_LICENSE.md)*.

apps/jsii-docgen/src/docgen/view/wing-filters.ts

@@ -6,6 +6,8 @@ export const VISIBLE_SUBMODULES = [
   "util",
   "redis",
   "http",
+  "math",
+  "regex",
 ];
 export const HIDDEN_METHODS = ["toString", "toJSON", "bind"];
 export const HIDDEN_PROPS = ["node", "display"];

docs/docs/04-standard-library/07-math/_category_.yml

@@ -0,0 +1,3 @@
+label: Math
+collapsible: true
+collapsed: true