Add Linkding entry to meta.json (#231)

* Add GitLab CE entry to meta.json

- Introduced a new entry for GitLab Community Edition, including a detailed description, logo, and relevant links.
- Reformatted tag lists for consistency across all entries.

* Add Linkding entry to meta.json

- Introduced a new entry for Linkding, a self-hosted bookmark manager, including a description, logo, and relevant links.
- Updated tag lists to include "bookmark-manager" and "self-hosted" for better categorization.

meta.json

@@ -875,6 +875,19 @@
     },
     "tags": ["open-source"]
   },
+  {
+    "id": "linkding",
+    "name": "Linkding",
+    "version": "latest",
+    "description": "Linkding is a self-hosted bookmark manager with a clean and simple interface.",
+    "logo": "linkding.svg",
+    "links": {
+      "github": "https://github.com/sissbruecker/linkding",
+      "website": "https://sissbruecker.github.io/linkding/",
+      "docs": "https://github.com/sissbruecker/linkding/blob/master/docs/Options.md"
+    },
+    "tags": ["bookmark-manager", "self-hosted"]
+  },
   {
     "id": "linkwarden",
     "name": "Linkwarden",