Rename PostCSS files to .pcss (#9013)

* Rename PostCSS files to `.pcss`

* Make Stylelint happy

* Delint

* Rename new files too

* delint

* Fix bad comment placement

res/css/components/views/location/_Marker.pcss

@@ -0,0 +1,46 @@
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+.mx_Marker_defaultColor {
+    color: $accent;
+}
+
+.mx_Marker_border {
+    width: 42px;
+    height: 42px;
+    border-radius: 50%;
+    filter: drop-shadow(0px 3px 5px rgba(0, 0, 0, 0.2));
+    background-color: currentColor;
+
+    display: flex;
+    justify-content: center;
+    align-items: center;
+
+    // caret down
+    &::before {
+        content: '';
+        border-left: 5px solid transparent;
+        border-right: 5px solid transparent;
+        border-top: 5px solid currentColor;
+        position: absolute;
+        bottom: -4px;
+    }
+}
+
+.mx_Marker_icon {
+    color: white;
+    height: 20px;
+}