Mobile display: bugs and improvements

[AlainRossier]

General guidelines

• Make sure it works for width at least 360px
• No overlay in mobile version

Pages that needs a mobile upgrade

• TalkSharingPage.tsx: a lot of the content overlap each other and buttons at the button are smaller than what they should be.
• ChannelPage.tsx: use the whole width and fix the size of buttons and overlaps.
• Home.tsx: left margins missing and text misaligned. Classification not working
• InformationPage.tsx: the "donating" button is misaligned and doesn't work
• OrganizerLandingPage.tsx: the toggle Yes/No at the bottom doesn't do anything (see desktop version for expected beahviour)

When the branch alain/profiles will be merged and deployed

• ProfilePage.tsx: do mobile version. Make sure the button "contact speaker" is working most importantly.
• AllSpeakers.tsx: do mobile version. See upcoming seminars to see how we display the classification for mobile.
• ProfileCard.tsx: do mobile version, in particular remove overlay and put a similar thing as talk cards in mobile.