Enable Crossposting from Slack to Discord for GitHub Notifications

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**Description:**

To ensure seamless communication across different platforms, we need to set up a system that allows messages received in specific Slack channels (originating from GitHub notifications) to be crossposted to corresponding channels in Discord. This will ensure that all team members, regardless of the platform they use, receive the same updates and notifications.

Acceptance Criteria:
Integration Setup:

Set up integration between Slack and Discord to enable crossposting.
Ensure that messages from GitHub notifications in designated Slack channels are automatically posted to corresponding Discord channels.
Channel Mapping:

Define a clear mapping between Slack channels and Discord channels where the messages will be crossposted.
Testing:

Test the integration to ensure that messages are correctly crossposted from Slack to Discord without any delays or data loss.
Confirm that all types of GitHub notifications (issues, pull requests, comments, etc.) are correctly crossposted.
Documentation:

Document the setup process, including any configuration steps required for both Slack and Discord.
Provide troubleshooting steps for common issues that might arise with the integration.
Example Workflow:
A GitHub issue is created and a notification is sent to the designated Slack channel.
The same message is automatically posted to the corresponding Discord channel.
Implementation Steps:
Choose an Integration Tool:

Research and choose a suitable integration tool or service (e.g., Zapier, Automate.io, or custom bot) that supports crossposting from Slack to Discord.
Set Up Integration:

Configure the chosen tool to monitor the designated Slack channels for GitHub notifications.
Set up the tool to post the messages from Slack to the mapped Discord channels.
Configure Channel Mapping:

Define the Slack to Discord channel mapping in the integration tool.
Ensure that the mapping covers all necessary channels.
Test the Integration:

Perform tests to ensure messages are crossposted correctly.
Check for any issues or delays in the crossposting process.

The issue names no repository files, tests, or entry points; begin by reviewing the Spring Web backend and clarifying the integration tool, credentials, and channel configuration. Done means mapped Slack and Discord channels crosspost all specified GitHub notifications reliably, with integration tests and setup and troubleshooting documentation.

Written by the indexing model from the issue text.