Add additional fallback images (#1898)

* Add additional fallback images

* Update src/assets/illustrations/feature/systems.svg

Co-authored-by: Tyler Sticka <[email protected]>

* Update .changeset/orange-planes-ring.md

Co-authored-by: Tyler Sticka <[email protected]>

* Update src/assets/illustrations/feature/accessibility.svg

Co-authored-by: Tyler Sticka <[email protected]>

* Update src/assets/illustrations/feature/maintenance.svg

Co-authored-by: Tyler Sticka <[email protected]>

* Update src/assets/illustrations/feature/process.svg

Co-authored-by: Tyler Sticka <[email protected]>

* Replace PNGs

* Replace SVGs

Co-authored-by: Tyler Sticka <[email protected]>

Author: AriannaChau

.changeset/orange-planes-ring.md

@@ -0,0 +1,5 @@
+---
+'@cloudfour/patterns': minor
+---
+
+Add fallback feature illustrations for `accessibility`, `process`, `systems` and `maintenance`