Notices Fix and Collisions

**Features:**
- [x] Use of `WC()->plugin_url() . '/assets/css/activation.css'`
- [x] Fix the notice message after the Storefront was hooked there. It was some closing tag issues.
- [x] Instead of `sprintf()` utilized the `printf()` as it directly prints the message and no need to use `echo`
- [ ] Collision with other theme or plugin query args `hide_theme_support_notice` , `hide_translation_upgrade` & `hide_template_files_notice` in the query so why not use them with woocommerce short prefix wc. i.e  `hide_wc_theme_support_notice`
- [x] Button secondary used so that text-decoration underlined is fixed to none :)