Fix GitHub page rendering

[bmarty]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

Fix rendering of GitHub page (will have to be deployed again), and add a column for the dark version of the screenshots.

Note: will give a try to https://github.com/actions/deploy-pages later, now the current solution to deploy the pages is working.

Motivation and context

Fixes and improvement

Screenshots / GIFs

Tests

• Step 1
• Step 2
• Step ...

Tested devices

• Physical
• Emulator
• OS version(s):

Checklist

• Changes have been tested on an Android device or Android emulator with API 23
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request includes a new file under ./changelog.d. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#changelog
• Pull request includes screenshots or videos if containing UI changes
• Pull request includes a sign off
• You've made a self review of your PR

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[jmartinesp]

Thanks!

[github-actions]

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