Inline css in diff emails (#4181)

* Extract email styles into head

* tsc

* Inline CSS in emails

package.json

@@ -105,6 +105,7 @@
     "i18next": "^20.6.1",
     "i18next-http-backend": "^1.3.2",
     "immutable": "^4.0.0",
+    "inline-css": "^4.0.1",
     "invariant": "^2.2.4",
     "ioredis": "^4.28.5",
     "is-printable-key-event": "^1.0.0",
@@ -141,7 +142,7 @@
     "node-htmldiff": "^0.9.4",
     "nodemailer": "^6.6.1",
     "outline-icons": "^1.45.2",
-    "oy-vey": "^0.11.2",
+    "oy-vey": "^0.12.0",
     "passport": "^0.6.0",
     "passport-google-oauth2": "^0.2.0",
     "passport-oauth2": "^1.6.1",
@@ -240,6 +241,7 @@
     "@types/fs-extra": "^9.0.13",
     "@types/fuzzy-search": "^2.1.2",
     "@types/google.analytics": "^0.0.42",
+    "@types/inline-css": "^3.0.1",
     "@types/invariant": "^2.2.35",
     "@types/ioredis": "^4.28.1",
     "@types/jest": "^28.1.6",