* Added Solidity to table of contents
* Added Solidity to the table of contents and moved solidity section from the java section.
* Solidity to heading level 3
Co-authored-by: CleanMachine1 <78213164+CleanMachine1@users.noreply.github.com>
Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>
Co-authored-by: CleanMachine1 <78213164+CleanMachine1@users.noreply.github.com>