feat: add atoms section inside developing guides (calcom#24220)

Author: Ryukemeister

docs/developing/guides/atoms/add-changesets.mdx

@@ -0,0 +1,8 @@
+---
+title: "Add changesets"
+---
+
+We use changesets for every PR that affects atoms, be it a fix or feature to add a log describing the fix or feature. Below video showcases how to add a changeset to a PR.
+
+<iframe style={{ width: "100%", maxWidth: "560px" }} height="315" src="https://www.loom.com/embed/2130c801b35248f6b878eb531eb62184?sid=0e2fe07b-59d4-4f31-beb0-7f267154de8b" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen="true"></iframe>
+

docs/mint.json

@@ -100,6 +100,11 @@
           "icon": "webhook",
           "pages": ["developing/guides/automation/webhooks"]
         },
+        {
+          "group": "Atoms",
+          "icon": "atom",
+          "pages": ["developing/guides/atoms/add-changesets"]
+        },
         {
           "group": "Email",
           "icon": "inbox",