Remove differences between master and dev branches

[praneesha]

Description

Currently, there are files in the dev branch that are different from the master branch as per [1].

We need to check them one by one manually and sync them.

[1] master...dev

Related website/documentation area

Add/Uncomment the relevant area label out of the following.

Area/Backend

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[praneesha]

This issue is invalid now as we have deleted the dev branch as per [1].

[1] https://github.com/ballerina-platform/ballerina-dev-website/branches