fix: move the UTC Timestamps checkbox into the Display well (closes #212)

README.md

@@ -719,8 +719,8 @@ of it.
       plus a "+ Add wallet" button
     - Tracked Tokens: one row per tracked token with an `[x]` remove button,
       plus a "+ Add token" button
-    - Display: "Show tracked tokens with zero balance" checkbox and a Theme
-      selector (System / Light / Dark)
+    - Display: "Show tracked tokens with zero balance" checkbox, "UTC
+      Timestamps" checkbox, and a Theme selector (System / Light / Dark)
     - Network: network selector (Ethereum Mainnet / Sepolia Testnet); switching
       resets the RPC and Blockscout endpoints to that network's defaults
     - Ethereum RPC: endpoint URL input + "Save" button (validated against
@@ -731,7 +731,6 @@ of it.
         - "Hide tokens with fewer than 1,000 holders" checkbox
         - "Hide transactions from detected fraud contracts" checkbox
         - "Hide dust transactions below N gwei" checkbox + threshold input
-        - "UTC Timestamps" checkbox
     - Allowed Sites: list with remove buttons
     - Denied Sites: list with remove buttons
     - About: project link, license, author, version, release date, and the