Adding ETSI data color scheme

  --md-line-accent-fg-color--tr:#40404080;

}

[data-md-color-scheme="etsi"] {

  --md-primary-fg-color:        #1538c5;

  --md-primary-fg-color--light: #9db2e2;

  --md-primary-fg-color--dark:  #290390;

  --md-typeset-a-color:         #b42025;

  --md-accent-fg-color:  		#005480;

  --md-line-accent-fg-color--tr:#40404080;

}

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