[Web] Update the Readme and remove unused scripts if not required

[mayuka-c]

• Update the Readme to properly reflect the steps required to start locally here: https://github.com/IBM/power-access-cloud/blob/main/web/README.md
• Also within index.html remove the scripts which are not required which avoids running unnecessary script:

  power-access-cloud/web/index.html

  Line 13 in 1bf98c8

  <script