DOC-3397: Fix Context7 branch config to index tinymce/8 (#4069)

The context7.json was claim-only (url + public_key), causing
Context7 to index the main branch which has zero documentation
pages. All doc content lives on tinymce/8. Add branch, folders,
and exclusion settings so Context7 parses the actual documentation.

Author: kemister85

context7.json

@@ -1,4 +1,26 @@
 {
+  "$schema": "https://context7.com/schema/context7.json",
   "url": "https://context7.com/tinymce/tinymce-docs",
-  "public_key": "pk_zfLsHseHKUL2Ys96GNqA5"
+  "public_key": "pk_zfLsHseHKUL2Ys96GNqA5",
+  "projectTitle": "TinyMCE",
+  "description": "TinyMCE rich text editor documentation — setup, configuration, plugins, APIs, and integration guides",
+  "branch": "tinymce/8",
+  "folders": [
+    "modules/ROOT/pages",
+    "modules/ROOT/partials",
+    "modules/ROOT/examples"
+  ],
+  "excludeFolders": [
+    "-new-material-templates",
+    "-scripts",
+    ".github",
+    "modules/ROOT/images",
+    "modules/ROOT/attachments"
+  ],
+  "excludeFiles": [
+    "LICENSE.txt",
+    "CODE_OF_CONDUCT.md",
+    "antora-playbook-local.yml",
+    ".env"
+  ]
 }