Merge branch 'master' of github.com:spotify/backstage into migrate-to-msw

* 'master' of github.com:spotify/backstage: (110 commits)
  chore(catalog-backend): removing redudant classes and some functions
  chore(deps-dev): bump @types/webpack from 4.41.21 to 4.41.22 (#2765)
  move codecov.yml to .github
  feat(catalog-backend): add batch concurrency
  create-app: remove build step
  cli: simplify jest transform ignore regex
  feat(catalog-backend): introduce batching, speed up reading and writing of large datasets
  Techdocs: add Azure DevOps prepare support (#2748)
  feat(techdocs-header): Show breadcrumbs on docs page (#2786)
  changesets: add entry for create-app template location fix
  create-app: revert to github location type for example templates
  fix: make catalog filter work again
  Use new url scheme for techdocs
  feat: remove LocationProcessor.processEntity
  Add Dockerfile for helm chart
  feat: use the new UrlReader in the CodeOwnersProcessor
  feat: use new UrlReader in PlaceholderProcessor
  feat: remove the backstage.io/definition-at-location annotation
  Update loud-lamps-visit.md
  feat(proxy-backend): limit the forwarded http headers to a safe set
  ...

plugins/welcome/src/components/WelcomePage/WelcomePage.tsx

@@ -69,7 +69,10 @@ const WelcomePage = () => {
                   the project and we have already begun work on various aspects
                   of these phases. The best way to keep track of the progress is
                   through the 
-                  <Link href="https://github.com/spotify/backstage/milestones">
+                  <Link
+                    href="https://github.com/spotify/backstage/milestones"
+                    rel="noopener noreferrer"
+                  >
                     Milestones
                   </Link>
                   .
@@ -113,7 +116,10 @@ const WelcomePage = () => {
               </Typography>
               <Typography variant="body1" paragraph>
                 We suggest you either check out the documentation for{' '}
-                <Link href="https://github.com/spotify/backstage/blob/master/docs/plugins/create-a-plugin.md">
+                <Link
+                  href="https://github.com/spotify/backstage/blob/master/docs/plugins/create-a-plugin.md"
+                  rel="noopener noreferrer"
+                >
                   creating a plugin
                 </Link>{' '}
                 or have a look in the code for the{' '}
@@ -121,7 +127,10 @@ const WelcomePage = () => {
                   existing plugins
                 </Link>{' '}
                 in the directory{' '}
-                <Link href="https://github.com/spotify/backstage/tree/master/plugins">
+                <Link
+                  href="https://github.com/spotify/backstage/tree/master/plugins"
+                  rel="noopener noreferrer"
+                >
                   <code>plugins/</code>
                 </Link>
                 .
@@ -135,7 +144,10 @@ const WelcomePage = () => {
                   <Link href="https://backstage.io">backstage.io</Link>
                 </ListItem>
                 <ListItem>
-                  <Link href="https://github.com/spotify/backstage/blob/master/docs/plugins/create-a-plugin.md">
+                  <Link
+                    href="https://github.com/spotify/backstage/blob/master/docs/plugins/create-a-plugin.md"
+                    rel="noopener noreferrer"
+                  >
                     Create a plugin
                   </Link>
                 </ListItem>