remove splide and upgrade yarn

package.json

 {
   "name": "osuny-hugo-theme",
-  "version": "6.0.13",
+  "version": "6.1.7",
   "repository": "git@github.com:osunyorg/theme.git",
   "author": "alexisben <alexis.benoit@noesya.coop>",
   "contributors": [
@@ -11,7 +11,6 @@
   ],
   "license": "MIT",
   "dependencies": {
-    "@splidejs/splide": "^4",
     "cssnano": "^5",
     "cssnano-preset-advanced": "^6.0.1",
     "glightbox": "^3",