Fix: properly display header on landing page

[MateuszRostkowski]

Description

Done:

• add full screen modal and hooks to use it easily
• improve header on landing page for mobiles

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Run web app -> open landing screen

Screenshot(s)

Please attach some screenshot or a movie if provided changes affects UI.

https://github.com/binarapps/baca-react-native-template/assets/38006370/60a128e2-ed4e-49f0-af21-4490e35dbbbe

Test Configuration:

• Firmware version:
• Hardware:
• Toolchain:
• SDK:

Checklist:

• [x] Add correct label to your pull request
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules