🔖(changeset) adding missing changesets

I forgot to add changeset when merging the PR#20, so I add a
dedicated commit to keep an history before bumping versions.

.changeset/mean-camels-rescue.md

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+---
+"@openfun/cunningham-react": patch
+---
+
+allow async font loading

.changeset/mean-stingrays-grin.md

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+---
+"@openfun/cunningham-react": minor
+---
+
+add DataGrid, SimpleDataGrid components

.changeset/proud-hornets-fix.md

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+---
+"@openfun/cunningham-react": minor
+---
+
+add button sizes: small and medium.

.changeset/strong-geckos-travel.md

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+---
+"@openfun/cunningham-react": minor
+---
+
+add Loader component

.changeset/tame-ravens-battle.md

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+---
+"@openfun/cunningham-react": minor
+---
+
+add Pagination component

.changeset/tricky-shirts-march.md

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+---
+"@openfun/cunningham-react": minor
+---
+
+add i18n

.changeset/warm-apples-fry.md

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+---
+"@openfun/cunningham-react": minor
+---
+
+add material icons

.changeset/warm-carrots-sneeze.md

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+---
+"@openfun/cunningham-react": minor
+---
+
+add active state on button