Fix XSS issue in teacher message

Add a purifying library.

Merge pull request changeweb#312 from handhikadj/master

Some bugfix and improve the docker setup

Merge pull request changeweb#295 from changeweb/dependabot/composer/f…

…acade/ignition-2.4.2

Bump facade/ignition from 2.3.3 to 2.4.2

Merge pull request changeweb#285 from changeweb/dependabot/npm_and_ya…

…rn/axios-0.21.1

Bump axios from 0.18.1 to 0.21.1

Merge pull request changeweb#259 from changeweb/UploadCertificate

Add Certificate upload feature

Merge pull request changeweb#257 from changeweb/funding-config

Fix Librarian Test fail

Merge pull request changeweb#241 from changeweb/laravel7

Upgrade to Laravel 7.X and other packages

Fix missing section and class id for Routine and Syllabus

Section id and class id were added in seed classes but forgot to add these in forms and uploadcontroller.

Fix master redirect after login

changeweb#208 issue. Master was not redirecting to `/masters` page after login in some cases. changeweb#208 (comment) this patch is made in this commit.

Fix readme formatting

Nesting was not done properly.