Display source contributors

[eralpkaraduman]

Display usernames with link to their github profiles on the website

• Maybe we could move website source link under "Source" title
• Then add all users who contributed listed under it
• Clicking github usernames should go to their github profiles
• Should also show small user profile pictures before names

We could use either;
https://github.com/ldd/gatsby-source-github-api
or
https://www.gatsbyjs.com/plugins/gatsby-source-github/

list of contributors is available in githubs api;
https://api.github.com/repos/nicework-company/unhandledexception.club/contributors

lets only fetch this at build time so that the data could be statically cached. So let's not fetch the data dynamically when site loads on browser.