ReplayWebpage V2 Docs Content Reorganization

[Shrinks99]

Context

As part of #250 we want to reorganize the content of our ReplayWebpage documentation.

Proposed Hierarchy

Each Item marked by the 📰 emoji is a distinct page. Some items have been moved from distinct pages to sections on a single page. Some items (marked by ❇️) are new!

ReplayWebpage Docs
    ├── 📰 ReplayWebpage Docs Homepage
    ├── User Guide
    │   ├── 📰 User Guide Homepage
    │   │   └── Supported File Type table
    │   ├── 📰 Loading Archived Items
    │   │   └── Sharing Archived Items with Google Drive
    |   ├── 📰 Offline Use
    │   └── 📰 Exploring Web Archives
    │       ├── Pages
    │       ├── Resources
    │       ├── View Page Info (v2 feature!) ❇️
    │       └── View Archive Info ❇️
    └── Developer Docs
        ├── 📰 Embedding ReplayWebpage
        ├── 📰 Loading Content from Replay.json ❇️
        ├── 📰 Supported Location URLs
        └── 📰 Configuring CORS

Remove / move content elsewhere

• Web Archive Collection Format Specification (link to WACZ spec where required)
• Contact
• Changelog
• Examples