Open "Best Practice" section using SEF Handbook in the sef-dev repo

[janithlahirukariyawasam]

Describe the bug
Well currently after we click on the best practices section on the sef-dev page, It will directed us to contribution.md file. You can use it to read our best practices. But instead the GitHub we can use SEF Handbook's Development Best Practice section.
With that, we can expect more user-friendliness.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'sef-dev'
2. Click on 'Best Practices
3. See error

Screenshots Of The Error
You need to click on the Best Practices blue button. Underlined in red color

Directed to Github's contribution.md file

Expected behavior
Instead of opening the Best Practice section using contribution.md file, We can use SEF handbook best practice section.

Are you working on it?
Yes

[janithlahirukariyawasam]

@anjula-sack Shall I work on this? We can expect more user-friendliness with it.