refactor: restore shell script extensions

Without an extension, the shell script configuration in `.gitattribute` will not work.

.github/workflows/ci.yml

@@ -42,4 +42,4 @@ jobs:
         run: npm i && npm run build
 
       - name: Test Site
-        run: bash tools/test
+        run: bash tools/test.sh

_posts/2019-08-09-getting-started.md

@@ -35,7 +35,7 @@ Sign in to GitHub to [fork **Chirpy**](https://github.com/cotes2020/jekyll-theme
 Next, clone the repository to your local machine, make sure it has [Node.js][nodejs] installed, then go to the root directory of the repo and run the following command:
 
 ```console
-$ bash tools/init
+$ bash tools/init.sh
 ```
 
 > If you don't want to deploy your site on GitHub Pages, append option `--no-gh` at the end of the above command.

package.json

@@ -156,8 +156,8 @@
       [
         "@semantic-release/exec",
         {
-          "prepareCmd": "bash tools/release --prepare",
-          "publishCmd": "bash tools/release"
+          "prepareCmd": "bash tools/release.sh --prepare",
+          "publishCmd": "bash tools/release.sh"
         }
       ],
       [

tools/release → tools/release.sh

@@ -37,7 +37,7 @@ help() {
   echo "  2. Merge the release branch into the default branch"
   echo
   echo "Usage:"
-  echo "  bash ./tools/release [options]"
+  echo "  bash $0 [options]"
   echo
   echo "Options:"
   echo "  --prepare           Preparation for release"

tools/test → tools/test.sh

@@ -19,7 +19,7 @@ help() {
   echo
   echo "Usage:"
   echo
-  echo "   bash ./tools/test [options]"
+  echo "   bash $0 [options]"
   echo
   echo "Options:"
   echo '     -c, --config   "<config_a[,config_b[...]]>"    Specify config file(s)'