Dead links in API docs

[gokul]

Description: The links for the functions in the time extension are broken and return with a 404 page.

Suggested Labels: docs

Affected Product Version: 5.0

OS, DB, other environment details and versions:

Steps to reproduce:

• Go to https://siddhi-io.github.io/siddhi-execution-time/
• Click on any function (e.g. "dateFormat (Function)")
• The 404 page will be displayed

[gokul]

Tracked in parent issue.