Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- `package.json`:
  No real conflict, upstream updated a dependency which is
  textually adjacent to a glitch-soc-specific dependency.
  Updated it.
- `yarn.lock`:
  No real conflict, upstream updated a dependency which is
  textually adjacent to a glitch-soc-specific dependency.
  Updated it.

package.json

@@ -74,7 +74,7 @@
     "array-includes": "^3.1.1",
     "arrow-key-navigation": "^1.1.0",
     "atrament": "0.2.4",
-    "autoprefixer": "^9.7.5",
+    "autoprefixer": "^9.7.6",
     "axios": "^0.19.2",
     "babel-loader": "^8.1.0",
     "babel-plugin-lodash": "^3.3.4",
@@ -114,7 +114,7 @@
     "mark-loader": "^0.1.6",
     "marky": "^1.2.1",
     "mini-css-extract-plugin": "^0.9.0",
-    "mkdirp": "^1.0.3",
+    "mkdirp": "^1.0.4",
     "npmlog": "^4.1.2",
     "object-assign": "^4.1.1",
     "object-fit-images": "^3.2.3",