Explore: return to grid layout for logs table

- better column control than flexbox
- increased gutter and row spacing

public/sass/pages/_explore.scss

@@ -294,31 +294,13 @@
     }
 
     .logs-entries {
+      display: grid;
+      grid-column-gap: 1rem;
+      grid-row-gap: 0.1rem;
       font-family: $font-family-monospace;
       font-size: 12px;
     }
 
-    .logs-row {
-      display: flex;
-      flex-direction: row;
-
-      > div + div {
-        margin-left: 0.5rem;
-      }
-    }
-
-    .logs-row-level {
-      width: 3px;
-    }
-
-    .logs-row-labels {
-      flex: 0 0 25%;
-    }
-
-    .logs-row-message {
-      flex: 1;
-    }
-
     .logs-row-match-highlight {
       // Undoing mark styling
       background: inherit;