fix(theme-default): heading anchor doesn't display when no sidebar or minimum content area (#1096)

Author: shulaoda

packages/theme-default/src/layout/DocLayout/docComponents/index.module.scss

@@ -4,8 +4,7 @@
   outline: none;
   :global(.header-anchor) {
     float: left;
-    margin-left: -0.87em;
-    padding-right: 0.23em;
+    margin-left: -0.8em;
     font-weight: 500;
     opacity: 0;
     font-size: inherit;

packages/theme-default/src/layout/DocLayout/index.module.scss

@@ -81,7 +81,7 @@
 
   .content {
     width: calc(100% - var(--rp-sidebar-width));
-    padding: 48px 48px 72px max(12px, calc(48px - var(--rp-sidebar-width)));
+    padding: 48px 48px 72px max(24px, calc(48px - var(--rp-sidebar-width)));
 
     :global(.rspress-doc),
     :global(.rspress-doc-footer) {