Use HTML beautifier to indent ERB files

We had inconsistent indentation in many places. Now we're fixing them
and adding a linter to our CI so we don't accidentally introduce
inconsistent indentations again.

app/components/admin/stats/budget_balloting_component.html.erb

@@ -30,7 +30,9 @@
 
 <table class="investment-projects-summary">
   <thead>
-    <tr><th colspan="2"><%= t("admin.stats.budget_balloting.votes_per_heading") %></th></tr>
+    <tr>
+      <th colspan="2"><%= t("admin.stats.budget_balloting.votes_per_heading") %></th>
+    </tr>
   </thead>
 
   <tbody>
@@ -49,7 +51,9 @@
 
 <table class="investment-projects-summary user-count-by-heading">
   <thead>
-    <tr><th colspan="2"><%= t("admin.stats.budget_balloting.participants_per_district") %></th></tr>
+    <tr>
+      <th colspan="2"><%= t("admin.stats.budget_balloting.participants_per_district") %></th>
+    </tr>
   </thead>
 
   <tbody>

app/components/admin/stats/stat_component.html.erb

@@ -1,5 +1,6 @@
 <div class="small-12 medium-4 column">
   <%= tag.p(**options) do %>
-    <%= text %> <br><span class="number"><%= amount %></span>
+    <%= text %> <br>
+    <span class="number"><%= amount %></span>
   <% end %>
 </div>