Description

Redesign of the public facing company page.

closes #525

Edit:

• Redesign of the public facing speakers page (some small details)
• Finishing the public facing companies page
• Redesigning the view page for company to match new design
• Redesigning the view page for presentation to match new design

The branch introduces also changes from feature/allow-dark-theme-logo that allow companies to upload dark mode logo as well as the light mode logo. This is also reflected in the index and show pages of the companies.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

What needs to be tested

• Check if pages are accessible
• Check if colours for the sponsorships correspond to approval
• Check if the listed changes are suitable
• Check if both logos can be uploaded
• Check that once both logos are in place, when switching between dark and light mode the logos change as well

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes