Add and apply property-no-deprecated stylelint rule

This rule was introduced in stylelint 16.23. Out of the deprecated
properties it detects, we were only using `word-wrap`.

According to the CSS Working Group [1]:

> For legacy reasons, UAs must treat word-wrap as a legacy name alias of
> the overflow-wrap property.

Since there's universal browser support for `overflow-wrap: break-word`
[2], we can safely replace `word-wrap` with `overflow-wrap`.

[1] https://drafts.csswg.org/css-text/#overflow-wrap-property
[2] https://caniuse.com/mdn-css_properties_overflow-wrap_break-word

.stylelintrc.yml

@@ -29,6 +29,7 @@ rules:
   max-nesting-depth: 4
   media-feature-name-no-vendor-prefix: true
   no-invalid-position-declaration: true
+  property-no-deprecated: true
   property-no-unknown: true
   property-no-vendor-prefix: true
   rule-empty-line-before:

app/assets/stylesheets/documents/document.scss

@@ -4,7 +4,7 @@
   }
 
   a {
-    word-wrap: break-word;
+    overflow-wrap: break-word;
 
     .document-metadata {
       &::before,

app/assets/stylesheets/layout.scss

@@ -2020,7 +2020,7 @@ table {
   position: relative;
 
   a {
-    word-wrap: break-word;
+    overflow-wrap: break-word;
   }
 
   > :first-child {
@@ -2139,7 +2139,7 @@ table {
 
       &.description {
         color: $body-font-color;
-        word-wrap: break-word;
+        overflow-wrap: break-word;
       }
     }
   }

app/assets/stylesheets/participation.scss

@@ -162,7 +162,7 @@
 
   h1,
   p {
-    word-wrap: break-word;
+    overflow-wrap: break-word;
   }
 
   .callout {
@@ -274,7 +274,7 @@
     position: relative;
 
     a {
-      word-wrap: break-word;
+      overflow-wrap: break-word;
     }
 
     .icon-video {
@@ -660,7 +660,7 @@
   }
 
   .investment-external-link a {
-    word-wrap: break-word;
+    overflow-wrap: break-word;
   }
 }
 
@@ -1334,7 +1334,7 @@
     }
 
     a {
-      word-wrap: break-word;
+      overflow-wrap: break-word;
     }
   }
 }