Remove the D2 Slack integration docs

docs/releases/0.1.3.md

@@ -2,7 +2,7 @@ Many have asked how to get the diagram to look like the one on D2's [cheat sheet
 
 ![sketch](https://user-images.githubusercontent.com/3120367/209235066-d8ad6b3c-d19b-491d-b014-407f3c47407f.png)
 
-The Slack app for D2 has now hit production, so if you're looking for the quickest way to express a visual model without interrupting the conversation flow, go to [https://d2lang.com/tour/slack/](https://d2lang.com/tour/slack/) to install.
+This release also introduced the Slack app for D2.
 
 Hope everyone is enjoying the holidays this week!
 
@@ -32,4 +32,3 @@ Hope everyone is enjoying the holidays this week!
 - Fixes edge case where `style` being defined in same scope as `sql_table` causes compiler to skip compiling `sql_table`. [#506](https://github.com/terrastruct/d2/issues/506)
 - Fixes panic passing a non-string value to `constraint`. [#248](https://github.com/terrastruct/d2/issues/248)
 - Fixes edge case where the key `null` was compiling wrongly. [#507](https://github.com/terrastruct/d2/issues/507)
-

docs/tour/extensions.md

@@ -11,7 +11,6 @@ Officially developed and maintained by the creators of D2.
 - [VSCode extension](/tour/vscode/)
 - [Vim plugin](/tour/vim/)
 - [Obsidian plugin](/tour/obsidian/)
-- [D2 app for Slack](/tour/slack/)
 - [Discord plugin](/tour/discord/)
 
 ## Community

sidebars.ts

@@ -141,13 +141,7 @@ const sidebars: SidebarsConfig = {
           type: "category",
           label: "Official",
           link: { type: "doc", id: "tour/vscode" },
-          items: [
-            "tour/vscode",
-            "tour/vim",
-            "tour/obsidian",
-            "tour/slack",
-            "tour/discord",
-          ],
+          items: ["tour/vscode", "tour/vim", "tour/obsidian", "tour/discord"],
         },
       ],
     },