feat: Add Open Collective link to documentation layout

shared/data/site.json

@@ -7,6 +7,7 @@
   "homepage": "https://tabler.io",
   "githubUrl": "https://github.com/tabler/tabler",
   "githubSponsorsUrl": "https://github.com/sponsors/codecalm",
+  "opencollectiveUrl": "https://opencollective.com/tabler",
   "xUrl": "https://x.com/tabler_io",
   "linkedinUrl": "https://www.linkedin.com/company/tabler-io",
   "changelogUrl": "https://github.com/tabler/tabler/releases",
@@ -305,7 +306,7 @@
       "hex": "var(--tblr-dribbble)",
       "abbr": "dr",
       "icon": "brand-dribbble",
-      "prop": "--tblr-dribbble" 
+      "prop": "--tblr-dribbble"
     },
     "github": {
       "title": "Github",
@@ -333,7 +334,7 @@
       "hex": "var(--tblr-vk)",
       "abbr": "vk",
       "icon": "brand-vk",
-      "prop": "--tblr-vk" 
+      "prop": "--tblr-vk"
     },
     "rss": {
       "title": "RSS",