Implement click-to-copy for code blocks. Code blocks with no syntax
highlight won't show the button

Additional changes:

- Bump up Popper and Bootstrap versions
- Move script-importing code from header to the scripts partial

Move styles from _variables to _styles_project so it easier to maintain styles. Privacy notice banner was offset was not visible when site was docked to partial view. This allows a user to view the privacy notice properly. Add styling to takton banner hero logo. Logo breaks flow. Chaning the css to fix this issue. Added var to scss to increase readability.