core: Tidy contributor onboarding, fix typos. (#12700)

core: Tidy contributor onboarding.

- Fixes typos.
- Fixes stale links.
- Tidies Makefile so that Poetry env is optional for hygiene commands.
- Remove mismatched YAML naming.
- Uses shebang on Python scripts.
- Document semver usage.
- Redirect OpenAPI schema.

Signed-off-by: Teffen Ellis <592134+GirlBossRush@users.noreply.github.com>

web/src/admin/applications/wizard/steps/ak-application-wizard-submit-step.ts

@@ -328,7 +328,7 @@ export class ApplicationWizardSubmitStep extends CustomEmitterElement(Applicatio
         if (!(this.wizard && app && provider)) {
             throw new Error("Submit step received uninitialized wizard context");
         }
-        // An empty object is truthy, an empty array is falsey. *WAT Javascript*.
+        // An empty object is truthy, an empty array is falsey. *WAT JavaScript*.
         const keys = Object.keys(this.wizard.errors);
         return match([this.state, keys])
             .with(["submitted", P._], () =>