[Project] Clean up icons files and tasks

[xak]

Detailed description

There are old gulp tasks, READMEs, and files from the previous icon process that need to be cleaned up.

Describe in detail the issue you're having.

A dev team recently tried to follow the steps to add a new icon and it did not work since we no longer generate the icons.

Is this a feature request (new component, new icon), a bug, or a general issue?

Bug

Is this issue related to a specific component?

Icons

If FEATURE REQUEST, describe the need

• Update icons/README.md
• Remove ops/gulp/icons.js

Additional information

The setup now is this ...

scss/icons

• icon.scss is the component file
• _settings.scss is used to generate the CSS for each icon and sizes
  • This file is managed manually
• icon-bak.scss is no longer used

icons

• README.md is out of date
  • Nothing is generated
• icons-data.json is not longer used
• icons-data.yml is no longer used
• icons-template.scss is no longer used
• sap-icons.yml is a data file for the SAP icons
  • It's not used but could be used to generate the SCSS and docs files
• svgs are no longer used

docs/data/

• icons.yml is the data file used by the docs
  • This file is managed manually