📝[Docs]: Become Volunteer Button

**What Docs changes are you proposing?**
I want to change the Become Volunteer Button which is not looking good

**Describe the solution you'd like**

https://github.com/akshitagupta15june/PetMe/assets/168094736/0c4b5fd2-76cf-472e-b0f4-5eb6fb289719

i would like to change Become Volunteer button to this new type given below

https://github.com/akshitagupta15june/PetMe/assets/168094736/508e060b-2fe8-4911-a6cc-bba8d9049f02

hello @akshitagupta15june please assign this issue to me under GSSoC and also level it