Remove Agora and 100ms guides.

[jeroenleenarts]

🎯 Goal

Describe why we are making this change

🛠 Implementation details

Describe the implementation

🎨 UI Changes

Add relevant screenshots

Before	After
img	img

Add relevant videos

Before	After

🧪 Testing

Explain how this change can be tested (or why it can't be tested)

Provide a patch below if it is necessary for testing

Provide the patch summary here

Provide the patch code here

☑️Contributor Checklist

General

• I have signed the Stream CLA (required)
• Assigned a person / code owner group (required)
• Thread with the PR link started in a respective Slack channel (#android-chat-core or #android-chat-ui) (required)
• PR targets the develop branch
• PR is linked to the GitHub issue it resolves

Code & documentation

• Changelog is updated with client-facing changes
• New code is covered by unit tests
• Comparison screenshots added for visual changes
• Affected documentation updated (KDocs, docusaurus, tutorial)

☑️Reviewer Checklist

• UI Components sample runs & works
• Compose sample runs & works
• UI Changes correct (before & after images)
• Bugs validated (bugfixes)
• New feature tested and works
• Release notes and docs clearly describe changes
• All code we touched has new or updated KDocs

🎉 GIF

Please provide a suitable gif that describes your work on this pull request