Adopt Compound Colours (#1086)

* Delete deprecated font tokens.

* Migrate from primaryContent to textPrimary/iconPrimary.

* Migrate from links to textLinkExternal.

* Migrate from secondaryContent to textSecondary/iconSecondary.

* Migrate from accent to textActionPrimary.

- Some uses changed to textPrimary or iconPrimary as necessary.
- Some manual tints removed now that that Sentry is fixed.

* Migrate alert to textCriticalPrimary/iconCriticalPrimary.

* Migrate from brand to textActionAccent/iconAccentTertiary.

* Migrate from background to bgCanvasDefault or text/iconOnSolidPrimary

* Migrate system to bgSubtleSecondary.

* Remove ElementUIColors and obsolete migrated colours.

* Migrate tertiaryContent/quaternaryContent/quinaryContent to Compound.

* Migrate bubblesYou/bubblesNotYou to use Compound.

* Update Compound.

ElementX/Sources/Screens/Authentication/ServerSelectionScreen/View/ServerSelectionScreen.swift

@@ -31,7 +31,7 @@ struct ServerSelectionScreen: View {
             .readableFrame()
             .padding(.horizontal, 16)
         }
-        .background(Color.element.background.ignoresSafeArea())
+        .background(Color.compound.bgCanvasDefault.ignoresSafeArea())
         .toolbar { toolbar }
         .alert(item: $context.alertInfo)
         .interactiveDismissDisabled()
@@ -46,12 +46,12 @@ struct ServerSelectionScreen: View {
             Text(L10n.commonSelectYourServer)
                 .font(.compound.headingMDBold)
                 .multilineTextAlignment(.center)
-                .foregroundColor(.element.primaryContent)
+                .foregroundColor(.compound.textPrimary)
             
             Text(L10n.screenChangeServerSubtitle)
                 .font(.compound.bodyMD)
                 .multilineTextAlignment(.center)
-                .foregroundColor(.element.tertiaryContent)
+                .foregroundColor(.compound.textSecondary)
         }
         .padding(.horizontal, 16)
     }