[SG-439] Add feature flags to web (#3092)

* Add feature flags to web

* Remove extra file from dev

apps/web/src/utils/flags.ts

@@ -0,0 +1,19 @@
+export type Flags = {
+  showTrial?: boolean;
+};
+
+export type FlagName = keyof Flags;
+
+export function flagEnabled(flag: FlagName): boolean {
+  return flags()[flag] == null || flags()[flag];
+}
+
+function flags(): Flags {
+  const envFlags = process.env.FLAGS as string | Flags;
+
+  if (typeof envFlags === "string") {
+    return JSON.parse(envFlags) as Flags;
+  } else {
+    return envFlags as Flags;
+  }
+}