make hdl configurable

pages/fdo/show/[prefix]/[suffix].tsx

 import React from 'react'
 
+import { HDL_URL } from '../../../../src/constants'
 import { ErrorComponent } from '../../../../src/components/ErrorComponent'
 import { GetServerSideProps } from 'next'
 import { serverSideTranslations } from 'next-i18next/serverSideTranslations'
@@ -24,7 +25,7 @@ import Cloud from '@mui/icons-material/Cloud'
 import VerifiedIcon from '@mui/icons-material/Verified'
 import ReportIcon from '@mui/icons-material/Report'
 
-const resolvePid = (pid: string) => `https://hdl.handle.net/${pid}`
+const resolvePid = (pid: string) => HDL_URL + `/${pid}`
 
 const ShowFDO = () => {
   const { params } = useParsed()

pages/fdo/show/[prefix]/sandbox.tsx

 import React from 'react'
 import { ErrorComponent } from '../../../../src/components/ErrorComponent'
 import { GetServerSideProps } from 'next'
+import { HDL_URL } from '../../../../src/constants'
 import { serverSideTranslations } from 'next-i18next/serverSideTranslations'
 import { useShow, useTranslate, useParsed, useCustom, useApiUrl } from '@refinedev/core'
 import { Show } from '@refinedev/mui'
@@ -26,7 +27,7 @@ import ReportIcon from '@mui/icons-material/Report'
 import { styled, ThemeProvider } from '@mui/material/styles'
 import Details from '../../../../src/components/fdos/details'
 
-const resolvePid = (pid: string) => `https://hdl.handle.net/${pid}`
+const resolvePid = (pid: string) => HDL_URL + `/${pid}`
 
 const ShowFDO = () => {
   const { params } = useParsed()

src/components/profiles/list.tsx

 import { IResourceComponentsProps } from '@refinedev/core'
+import { HDL_URL } from '../../constants'
 import Link from '@mui/material/Link'
 
 import { List, useDataGrid } from '@refinedev/mui'
@@ -33,7 +34,7 @@ const columns: Array<GridColDef<IProfile>> = [
     width: 300,
     renderCell: (params) => {
       const pid = params?.row.attributes.pid
-      return <Link href={'https://hdl.handle.net/' + pid}>{pid}</Link>
+      return <Link href={HDL_URL + '/' + pid}>{pid}</Link>
     }
   }
 ]

src/constants.js

 import { version } from './version'
 export const API_URL = process.env.NEXT_PUBLIC_API_URL || '/api'
+export const HDL_URL = process.env.NEXT_PUBLIC_HDL_URL || 'https://hdl.handle.net'
 export const FDO_MANAGER_WEBUI_VERSION = version