css: Re-add bootstrap CSS defined using "table" class.

This commit re-adds bootstrap CSS rules defined using "table"
class to the specific CSS files where CSS for different tables
is present.

This is a prep commit for removing table related bootstrap CSS
from bootstrap.css.

web/styles/app_components.css

@@ -698,6 +698,8 @@ div.overlay {
     table-layout: auto;
     border-collapse: separate;
     border-spacing: 0;
+    margin-bottom: 20px;
+    width: 100%;
 
     &:not(.table-bordered) thead th {
         border-top: 1px solid hsl(0deg 0% 0% / 20%) !important;
@@ -754,6 +756,14 @@ div.overlay {
     td {
         padding: 4px 5px;
     }
+
+    & th {
+        text-align: left;
+    }
+
+    & td {
+        border-top: 1px solid hsl(0deg 0% 87%);
+    }
 }
 
 .table-bordered {
@@ -762,11 +772,19 @@ div.overlay {
     border-left: 0;
     border-radius: 4px;
     border-spacing: 0;
+    width: 100%;
+    margin-bottom: 20px;
 
     & th,
     td {
         border-left: 1px solid hsl(0deg 0% 87%);
+        border-top: 1px solid hsl(0deg 0% 87%);
         padding: 4px 5px;
+        text-align: left;
+    }
+
+    thead tr:first-child th {
+        border-top: 0;
     }
 
     thead tr:first-child > th:first-child {

web/styles/dark_theme.css

@@ -921,7 +921,8 @@
     #settings_page .sidebar-wrapper *,
     table,
     table th,
-    table td {
+    table td,
+    #recent_topics_table table td {
         border-color: hsl(0deg 0% 0% / 20%);
     }
 

web/styles/portico/activity.css

@@ -2,12 +2,6 @@
     background-color: hsl(208deg 100% 97%);
 }
 
-.table td {
-    padding-top: 2px;
-    padding-bottom: 2px;
-    white-space: nowrap;
-}
-
 .table-striped {
     & tr.recently_active {
         & td {
@@ -20,10 +14,6 @@
     }
 }
 
-td.number {
-    text-align: right;
-}
-
 .summary-table,
 .analytics_table {
     border: 1px solid hsl(0deg 0% 87%);
@@ -31,10 +21,27 @@ td.number {
     border-left: 0;
     border-radius: 4px;
     border-spacing: 0;
+    width: 100%;
 
     & th,
     td {
         border-left: 1px solid hsl(0deg 0% 87%);
+        text-align: left;
+
+        &.number {
+            text-align: right;
+        }
+    }
+
+    th {
+        vertical-align: bottom;
+        padding: 8px;
+    }
+
+    td {
+        border-top: 1px solid hsl(0deg 0% 87%);
+        white-space: nowrap;
+        padding: 2px 8px;
     }
 
     tbody > tr:nth-child(odd) > td {
@@ -56,6 +63,10 @@ td.number {
     tbody tr:last-child > td:last-child {
         border-bottom-right-radius: 4px;
     }
+
+    thead tr:first-child th {
+        border-top: 0;
+    }
 }
 
 .summary-table {

web/styles/portico/portico.css

@@ -567,6 +567,20 @@ input.text-error {
     box-shadow: 0 0 4px hsl(0deg 0% 0% / 10%);
 
     border-collapse: collapse;
+    margin-bottom: 20px;
+
+    thead tr:first-child th {
+        border-top: 0;
+    }
+
+    & th,
+    td {
+        padding: 8px;
+        line-height: 20px;
+        text-align: left;
+        vertical-align: top;
+        border-top: 1px solid hsl(0deg 0% 87%);
+    }
 
     tbody > tr:nth-child(odd) > td {
         background-color: hsl(0deg 0% 98%);

web/styles/recent_topics.css

@@ -93,6 +93,16 @@
             */
             margin-bottom: var(--max-unexpanded-compose-height);
             border-spacing: 0;
+            width: 100%;
+
+            th {
+                padding: 8px;
+                text-align: left;
+            }
+
+            td {
+                border-top: 1px solid hsl(0deg 0% 87%);
+            }
         }
 
         #recent_topics_filter_buttons {