Update language on /outline help text

Update Slack hooks to use zod validation

closes #5768

plugins/slack/server/api/schema.ts

@@ -0,0 +1,44 @@
+import { z } from "zod";
+
+export const HooksUnfurlSchema = z.object({
+  body: z
+    .object({
+      challenge: z.string(),
+    })
+    .or(
+      z.object({
+        token: z.string(),
+        event: z.object({
+          channel: z.string(),
+          message_ts: z.string(),
+          links: z.array(
+            z.object({
+              url: z.string(),
+            })
+          ),
+          user: z.string(),
+        }),
+      })
+    ),
+});
+
+export type HooksUnfurlReq = z.infer<typeof HooksUnfurlSchema>;
+
+export const HooksSlackCommandSchema = z.object({
+  body: z.object({
+    token: z.string(),
+    team_id: z.string(),
+    user_id: z.string(),
+    text: z.string().optional().default(""),
+  }),
+});
+
+export type HooksSlackCommandReq = z.infer<typeof HooksSlackCommandSchema>;
+
+export const HooksInteractiveSchema = z.object({
+  body: z.object({
+    payload: z.string(),
+  }),
+});
+
+export type HooksInteractiveReq = z.infer<typeof HooksInteractiveSchema>;