Update Travis for HonKit build (algorithm-archivists#728)

* Update Travis for HonKit build

* Fix HonKit build commands and location of book build dir

Author: berquist

.travis.yml

@@ -6,22 +6,10 @@ node_js:
   - "12"
 
 before_script:
-  - mkdir -p "${TRAVIS_BUILD_DIR}"/build
-  - CHANGED_FILES=$(git diff --name-only HEAD~1...HEAD .)
-  - |
-      if echo $CHANGED_FILES | grep "package.json"
-      then
-        cp package.json "${TRAVIS_BUILD_DIR}"/build
-      fi
+  - BOOK_BUILD_DIR="${TRAVIS_BUILD_DIR}"/_book
 
 script:
-  - |
-      if echo $CHANGED_FILES | grep "package.json"
-      then
-        npm build --reload . ${TRAVIS_BUILD_DIR}/build
-      else
-        npm build . ${TRAVIS_BUILD_DIR}/build
-      fi
+  - npm run build
 
 after_success:
     - |

tools/deploy/update_site_travis.bash

@@ -33,14 +33,13 @@ git config user.email "[email protected]"
 
 GH_REPO_REF="github.com/${DOCS_REPO_OWNER}/${DOCS_REPO_NAME}.git"
 
-# Assume the book has already been built, and was moved to `build/`
-# inside the same directory as this script.
+# Assume the book has already been built and lives in $BOOK_BUILD_DIR.
 
-if [ -d build ]; then
+if [ -d "${BOOK_BUILD_DIR}" ]; then
     echo "${bold}Cloning the website repo...${normal}"
     git clone -b "${DOCS_BRANCH_NAME}" https://git@"${GH_REPO_REF}"
     rm -rf ./"${DOCS_REPO_NAME}"/*
-    cp -a ./build/* ./"${DOCS_REPO_NAME}"
+    cp -a "${BOOK_BUILD_DIR}"/* ./"${DOCS_REPO_NAME}"
     pushd ./"${DOCS_REPO_NAME}"
     echo "www.algorithm-archive.org" > CNAME
     echo "${bold}Adding changes...${normal}"