Update achievements

What does this MR do and why?

Update achievements

• Make icons larger
• Move counter badges

Screenshots or screen recordings (pretend these are different achievements with counters > 1)

Before	After

How to set up and validate locally

• Look at user profile achievements
• I didn't have multiple achievements of the same type locally, so removed v-if="showCountBadge(userAchievement.count)" on the badge in app/assets/javascripts/profile/components/user_achievements.vue

Links

• ✂️ UX Paper Cuts 17.3 → Dark mode - Design Support (#452231)