* Update free-programming-cheatsheets.md
Update broken link from Docker Section.
* Adding Web3 Content
* Adding Web3 Content
* Update Web3 Content
* Update Web3 Content
* Update Web3 Content
* Update Web3 Content
* use titles as it is and then alphabetize
* use crosslinks to reference base sections: BlockChain & Solidity
* Update courses/free-courses-en.md
Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>
Co-authored-by: Eric Hellman <eric@hellman.net>