Change default color and some messages

[lcduong]

Update default color for Eventyay-talk after it got impacted after synced upstream

Summary by Sourcery

Change the default color scheme to #2185d0 and update branding references from 'pretalx' to 'eventyay' throughout the project.

Enhancements:

• Update default color scheme from #3aa57c to #2185d0 across various components and styles.

Chores:

• Replace references from 'pretalx' to 'eventyay' in URLs, email addresses, and documentation links.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR updates the branding and styling from Pretalx to Eventyay, primarily changing the default color scheme from #3aa57c (green) to #2185d0 (blue) and updating various text references and URLs throughout the codebase.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Changed the primary color scheme from green (#3aa57c) to blue (#2185d0)	Updated header background color Modified link colors and hover states Changed border colors for various UI elements Updated widget and schedule preview colors Modified coverage badge color in GitHub workflow	doc/_themes/pretalx_theme/static/css/pretalx.css src/pretalx/static/common/css/_variables.css src/pretalx/static/common/js/availabilities.js src/pretalx/static/orga/js/cfp_flow.js src/pretalx/static/orga/js/stats.js .github/workflows/tests.yml
Updated branding text and URLs from Pretalx to Eventyay	Changed documentation and support URLs Updated project URLs in pyproject.toml Modified system messages and notifications Updated API documentation references Changed widget and schedule-related text	pyproject.toml src/pretalx/common/models/settings.py src/pretalx/common/templates/500.html src/pretalx/orga/templates/orga/settings/widget.html src/pretalx/api/templates/rest_framework/api.html src/pretalx/orga/templates/orga/base.html src/pretalx/common/templates/common/user_api_token.html src/pretalx/orga/forms/event.py

Possibly linked issues

• Set up admin.susi.ai as CNAME #1: The PR changes colors to #2185d0, matching the issue's requirement for eventyay blue.
• Set up admin.susi.ai as CNAME #1: PR changes 'pretalx' to 'eventyay' in URLs and messages, aligning with issue's renaming task.

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[sourcery-ai]

Hey @lcduong - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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