As a developer, I want to understand more about Gitcoin from the landing page

### User Story

[comment]: # (As a , I want to so that .)
As a developer, I want to understand more about Gitcoin from the landing page

### Why Is this Needed

[comment]: # (Describe the problem and why this task is needed. Provide description of the current state, what you would like to happen, and what actually happen)
*Summary*:

- The homepage explains what Gitcoin is, but not why a developer would want to join the community.
- Possibility to streamline the homepage with a decision tree
- What is Web3? - useful for developers who are new to crypto

### Description

[comment]: # (Feature or Bug? i.e Type: Bug)
*Type*: Feature

### Current Behavior
[comment]: # (Describe what actually happened.)

### Expected Behavior
[comment]: # (Describe what you expected to happen.)

### Definition of Done
[comment]: # (Any other information that would be useful, bullets are helpful.)