Fix invalid links on Main and Team pages #43
Description
Invalid links:
- in https://github.com/scidsg/hushline-website/blob/main/src/index.html
- invalid link: https://tips.hushline.app/to/scidsg
- in https://github.com/scidsg/hushline-website/blob/main/src/team.html
- invalid link in two places: https://opencollective.com/scidsg/contribute/hush-line-supporter-55786
- in https://hushline.app/team.html
- invalid links in header menu: https://hushline.app/team.html#pricing and https://hushline.app/team.html#faq