adding the svg's for the back and validate buttons

frontend/public/icons/back.svg

+<svg width="90" height="83" viewBox="0 0 90 83" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M24.6669 3L4.00024 23.6667M4.00024 23.6667L24.6669 44.3333M4.00024 23.6667L76.6666 23.6667C82.1894 23.6667 86.6666 28.1439 86.6666 33.6667V70.5001C86.6666 76.0229 82.1894 80.5001 76.6666 80.5001H9.16659" stroke="#CCCCCC" stroke-width="5" stroke-linecap="round"/>
+</svg>
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frontend/public/icons/validate.svg

+<svg width="109" height="109" viewBox="0 0 109 109" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M30.6013 58.0656C29.625 57.0893 28.042 57.0893 27.0657 58.0656C26.0894 59.0419 26.0894 60.6248 27.0657 61.6011L30.6013 58.0656ZM44.3335 75.3334L42.5657 77.1011L44.3335 78.8689L46.1013 77.1011L44.3335 75.3334ZM82.2679 40.9345C83.2442 39.9581 83.2442 38.3752 82.2679 37.3989C81.2916 36.4226 79.7087 36.4226 78.7324 37.3989L82.2679 40.9345ZM27.0657 61.6011L42.5657 77.1011L46.1013 73.5656L30.6013 58.0656L27.0657 61.6011ZM46.1013 77.1011L82.2679 40.9345L78.7324 37.3989L42.5657 73.5656L46.1013 77.1011ZM54.6667 108.833C84.5821 108.833 108.833 84.5821 108.833 54.6667H103.833C103.833 81.8207 81.8207 103.833 54.6667 103.833V108.833ZM108.833 54.6667C108.833 24.7512 84.5821 0.5 54.6667 0.5V5.5C81.8207 5.5 103.833 27.5127 103.833 54.6667H108.833ZM54.6667 0.5C24.7512 0.5 0.5 24.7512 0.5 54.6667H5.5C5.5 27.5127 27.5127 5.5 54.6667 5.5V0.5ZM0.5 54.6667C0.5 84.5821 24.7512 108.833 54.6667 108.833V103.833C27.5127 103.833 5.5 81.8207 5.5 54.6667H0.5Z" fill="#CCCCCC"/>
+</svg>
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