Update HTML file using the workflow

[muktoakash]

• Please check if the PR fulfills these requirements

• [ x] The commit message follows our contribution guidelines
• [ x] Tests for the changes have been added (for bug fixes / features)
• [ x] Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) Updates the readme file with step-by-step description of how to use this repo to update index.html (or any other html file for that matter). Very useful for automatically updating webpages that are hosted through Github Pages.

• What is the current behavior? (You can also link to an open issue here) Currently all updates happen to README.md of the user's repo. While this is nice, it is even nicer to have the option to automatically update and deploy webpages hosted on Github.

• What is the new behavior (if this is a feature change)? N/A. This just updates the ReadMe file with new instructions.

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?) Repo needs to be forked and action.yml needs to be modified.

• Other information: This is mostly an information update. I had to figure out how to do it myself, so thought others may also benefit from this information.