Replace coloris with vanilla-colorful (#30201)

Found [a better color
picker](https://github.com/web-padawan/vanilla-colorful) that [does not
rely](https://github.com/mdbassit/Coloris/issues/139) on
`querySelectorAll` or a global shared instance, and is also around a
third of the size of the previous one.

The popover is handled by tippy.js for which I introduced a new "bare"
theme and it uses a new sibling-based mechanism which should prove
useful later to create tippy popovers via HTML only.

<img width="846" alt="Screenshot 2024-03-31 at 04 03 38"
src="https://github.com/go-gitea/gitea/assets/115237/7639b911-a2d7-4f5c-bffd-a9d84561e747">

package-lock.json

@@ -13,7 +13,6 @@
         "@github/relative-time-element": "4.4.0",
         "@github/text-expander-element": "2.6.1",
         "@mcaptcha/vanilla-glue": "0.1.0-alpha-3",
-        "@melloware/coloris": "0.23.0",
         "@primer/octicons": "19.9.0",
         "add-asset-webpack-plugin": "2.0.1",
         "ansi_up": "6.0.2",
@@ -54,6 +53,7 @@
         "toastify-js": "1.12.0",
         "tributejs": "5.1.3",
         "uint8-to-base64": "0.2.0",
+        "vanilla-colorful": "0.7.2",
         "vue": "3.4.21",
         "vue-bar-graph": "2.0.0",
         "vue-chartjs": "5.3.0",
@@ -1290,11 +1290,6 @@
         "@mcaptcha/core-glue": "^0.1.0-alpha-5"
       }
     },
-    "node_modules/@melloware/coloris": {
-      "version": "0.23.0",
-      "resolved": "https://registry.npmjs.org/@melloware/coloris/-/coloris-0.23.0.tgz",
-      "integrity": "sha512-VGIjI9+IQwg6BHjIE10yl0K2ARYz5bsjn6BgFEs1y1ErPAQymgdoxwVcSVL4Ai5t9OVs8xaCB7JKHqFu2N96Ow=="
-    },
     "node_modules/@nodelib/fs.scandir": {
       "version": "2.1.5",
       "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
@@ -11853,6 +11848,11 @@
         "builtins": "^1.0.3"
       }
     },
+    "node_modules/vanilla-colorful": {
+      "version": "0.7.2",
+      "resolved": "https://registry.npmjs.org/vanilla-colorful/-/vanilla-colorful-0.7.2.tgz",
+      "integrity": "sha512-z2YZusTFC6KnLERx1cgoIRX2CjPRP0W75N+3CC6gbvdX5Ch47rZkEMGO2Xnf+IEmi3RiFLxS18gayMA27iU7Kg=="
+    },
     "node_modules/vite": {
       "version": "5.2.6",
       "resolved": "https://registry.npmjs.org/vite/-/vite-5.2.6.tgz",