add feedback link to header

Author: Indraneel Purohit

app/src/components/Header.tsx

@@ -126,6 +126,7 @@ function Header(props: { isMobile: boolean; }) {
         <div>
           <ButtonLink url="/about">About</ButtonLink>
           <ButtonLink url="/methods">Methods</ButtonLink>
+          <ButtonLink url="https://datagather.tsdataclinic.com/published/data-clinic-product-feedback">Feedback</ButtonLink>
           <ModalLink modalContents={<LegalContents />}>Legal</ModalLink>
         </div>
         :
@@ -139,6 +140,7 @@ function Header(props: { isMobile: boolean; }) {
         <div className='hidden sm:block'>
           <ButtonLink url="/about">About</ButtonLink>
           <ButtonLink url="/methods">Methods</ButtonLink>
+          <ButtonLink url="https://datagather.tsdataclinic.com/published/data-clinic-product-feedback">Feedback</ButtonLink>
           <ModalLink modalContents={<LegalContents />}>Legal</ModalLink>
         </div>
         <div className='block sm:hidden'>