✨ (bootsier): Añade AdminLTE 4 y Bootstrap Icons

Integra AdminLTE 4.0.0 (SCSS y JS), Bootstrap Icons 1.13.1 y las fuentes
Source Sans 3 VF; reorganiza los SCSS del tema con la nueva estructura
de *pagetop-build*.

extensions/pagetop-bootsier/assets/adminlte-4.0.0/scss/_table.scss

@@ -0,0 +1,67 @@
+//
+// Component: Table
+//
+
+.table {
+  &:not(.table-dark) {
+    color: inherit;
+  }
+
+  // fixed table head
+  // Uses Bootstrap CSS variables so the sticky header follows light/dark mode
+  // automatically. Fixes #6026.
+  &.table-head-fixed {
+    thead tr:nth-child(1) th {
+      position: sticky;
+      top: 0;
+      z-index: 10;
+      background-color: var(--bs-body-bg, #{$white});
+      border-bottom: 0;
+      box-shadow: inset 0 1px 0 var(--bs-border-color, #{$table-border-color}), inset 0 -1px 0 var(--bs-border-color, #{$table-border-color});
+    }
+  }
+
+  // no border
+  &.no-border {
+    &,
+    td,
+    th {
+      border: 0;
+    }
+  }
+
+  // .text-center in tables
+  &.text-center {
+    &,
+    td,
+    th {
+      text-align: center;
+    }
+  }
+
+  &.table-valign-middle {
+    thead > tr > th,
+    thead > tr > td,
+    tbody > tr > th,
+    tbody > tr > td {
+      vertical-align: middle;
+    }
+  }
+
+  .card-body.p-0 & {
+    thead > tr > th,
+    thead > tr > td,
+    tfoot > tr > th,
+    tfoot > tr > td,
+    tbody > tr > th,
+    tbody > tr > td {
+      &:first-of-type {
+        padding-left: map-get($spacers, 4);
+      }
+
+      &:last-of-type {
+        padding-right: map-get($spacers, 4);
+      }
+    }
+  }
+}