[css-align] Fix broken links.

Author: tabatkins

css-align/Overview.html

@@ -1719,8 +1719,8 @@ <h2 id=changes><span class=secno>7. </span> Changes</h2>
 
    <li>Added both ‘<a href="#safe"><code class=css>safe</code></a>’ and
     ‘<a href="#true"><code class=css>true</code></a>’ as <a
-    href="file:///home/fantasai/w3c/csswg/css-align/Overview.html#overflow-values">overflow
-    alignment keywords</a> and made the default layout-mode-dependent.
+    href="#overflow-values">overflow alignment keywords</a> and made the
+    default layout-mode-dependent.
 
    <li>Removed ‘<code class=css>head</code>’ and ‘<code
     class=css>foot</code>’ keywords, defined ‘<a href="#start"><code
@@ -1733,9 +1733,7 @@ <h2 id=changes><span class=secno>7. </span> Changes</h2>
     class=property>self-end</code></a>’‘<code class=css> to be relative
     to the <a href="#alignment-subject"><i>alignment subject</i></a>. </code>
 
-   <li>Filled out details on <a
-    href="file:///home/fantasai/w3c/csswg/css-align/Overview.html#baseline">baseline
-    alignment</a>.
+   <li>Filled out details on <a href="#baseline">baseline alignment</a>.
 
    <li>Made ’justify-items' handle the
     <code>&lt;CENTER&gt;></code>/<code>align</code> attribute requirements by

css-align/Overview.src.html

@@ -1068,12 +1068,12 @@ <h2 id="changes">
     <li>Defined terms <i>alignment container</i> and <i>alignment subject</i>
       to make ti easier to define alignment.
     <li>Pulled out all value definitions into a general section on <a href="#alignment-values">Alignment Values</a>.
-    <li>Added both ''safe'' and ''true'' as <a href="file:///home/fantasai/w3c/csswg/css-align/Overview.html#overflow-values">overflow alignment keywords</a>
+    <li>Added both ''safe'' and ''true'' as <a href="#overflow-values">overflow alignment keywords</a>
       and made the default layout-mode-dependent.
     <li>Removed ''head'' and ''foot'' keywords,
       defined ''start'' and ''end'' keywords as relative to the <i>alignment container</i>'s <i>writing mode</i>,
       and added ''self-start'' and ''self-end'' to be relative to the <i>alignment subject</i>.
-    <li>Filled out details on <a href="file:///home/fantasai/w3c/csswg/css-align/Overview.html#baseline">baseline alignment</a>.
+    <li>Filled out details on <a href="#baseline">baseline alignment</a>.
     <li>Made 'justify-items' handle the <code>&lt;CENTER&gt;></code>/<code>align</code> attribute requirements
       by adding ''legacy'' keyword.
     <li>Added <i>fallback alignment</i> ability for 'justify-content' and 'align-content'.