Change fonts to match eventyay-tickets

[yaxit24]

Fixes #356

Summary by Sourcery

Switch primary and title fonts to Open Sans, include its font files, update fallbacks to add Arial, and adjust button font weight

Enhancements:

• Add @font-face declarations for Open Sans in regular, bold, italic, and bold italic styles
• Replace primary and title font-family variables with Open Sans and include Arial in the fallback stack
• Adjust button font weight from 600 to 500

[sourcery-ai]

Reviewer's Guide

Adds Open Sans webfont declarations and updates global font settings to use Open Sans, including improved fallbacks and adjusted button weights.

File-Level Changes

Change	Details	Files
Added Open Sans @font-face declarations	Four new @font-face blocks for regular, bold, italic, and bold-italic variants Sources specified in both WOFF2 and WOFF formats font-display set to swap for all variants	src/pretalx/static/common/css/_fonts.css
Updated global font variables and button styling	Added Arial to fallback font list Set --font-family and --font-family-title to Open Sans Reduced font-weight on title buttons from 600 to 500	src/pretalx/static/common/css/_fonts.css

Possibly linked issues

• #356: The PR changes fonts in _fonts.css to 'Open Sans' to match eventyay-tickets as requested by the issue.
• #356: The PR changes font weights and families in CSS to address the bold text issue in the left menu.

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[sourcery-ai]

Hey @yaxit24 - I've reviewed your changes - here's some feedback:

• You’re still including the Titillium Web @font-face definitions even though you switched --font-family-title to Open Sans—consider removing the unused Titillium Web blocks to slim down the CSS.
• You set button font-weight to 500 but only imported weights 400 and 700—either import the 500 (semibold) font-face or pick one of the already-loaded weights to avoid synthetic font rendering.

Prompt for AI Agents

Please address the comments from this code review:
## Overall Comments
- You’re still including the Titillium Web @font-face definitions even though you switched --font-family-title to Open Sans—consider removing the unused Titillium Web blocks to slim down the CSS.
- You set button font-weight to 500 but only imported weights 400 and 700—either import the 500 (semibold) font-face or pick one of the already-loaded weights to avoid synthetic font rendering.

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[yaxit24]

[Saksham-Sirohi]

pull request shows a lot of changes @yaxit24

[mariobehling]

Closing as we are now working on eventyay next.