docs: remove DummySearchPage

The DummySearchPage was introduced in 29b02b4 (docs: add
DummySearchPage.html, 2018-02-02). With it, additional build steps were
added to the build.gradle, .travis.yml files so that the DummySearchPage
would be copied into the build/docs/html5 directory, and would be
deployed with the rest of the documentation to
https://se-edu.github.io/addressbook-level4/DummySearchPage.html.

However, this also meant that downstream forks would also receive these
additional build steps, even though they do not need them. We only need
one single DummySearchPage to be published at one single public URL, and
thus these build steps are unnecessary for downstream forks.

We have already copied the DummySearchPage and published it at
https://se-edu.github.io/dummy-search-page/. As such, let's remove the
DummySearchPage and build steps from this codebase, so that we can
simplify our build and CI configuration.

.travis.yml

@@ -5,7 +5,7 @@ matrix:
 
 script: >-
     ./config/travis/run-checks.sh &&
-    ./gradlew clean checkstyleMain checkstyleTest headless allTests coverage coveralls asciidoctor copyDummySearchPage
+    ./gradlew clean checkstyleMain checkstyleTest headless allTests coverage coveralls asciidoctor
 
 deploy:
   skip_cleanup: true

build.gradle

@@ -231,11 +231,6 @@ task deployOfflineDocs(type: Copy) {
     }
 }
 
-task copyDummySearchPage(type: Copy) {
-    from 'docs/DummySearchPage.html'
-    into "${buildDir}/docs/html5"
-}
-
 deployOfflineDocs.dependsOn asciidoctor
 processResources.dependsOn deployOfflineDocs
 

src/main/java/seedu/address/ui/BrowserPanel.java

@@ -21,8 +21,7 @@
 public class BrowserPanel extends UiPart<Region> {
 
     public static final String DEFAULT_PAGE = "default.html";
-    public static final String SEARCH_PAGE_URL =
-            "https://se-edu.github.io/addressbook-level4/DummySearchPage.html?name=";
+    public static final String SEARCH_PAGE_URL = "https://se-edu.github.io/dummy-search-page/?name=";
 
     private static final String FXML = "BrowserPanel.fxml";