chore(deps): update dependency @vueuse/core to v15 - #83

Changed pages include:

• index.html - view
• 404.html - view
• guide/index.html - view
• plugins.html - view
• guide/badges.html - view
• guide/compatibility.html - view
• guide/discovery.html - view
• guide/extended-metadata.html - view
• guide/patches.html - view