Revert "fix: global installs do not work as I expected (#319)"

This reverts commit 9dd38e4.

.github/actions/slackify-markdown/action.yml

@@ -19,21 +19,12 @@ runs:
       uses: actions/setup-node@v3
       with:
         node-version: 16
-    - name: Create and initialize slackify directory
-      shell: bash
-      run: | # We need to create a directory to install the slackify-markdown package to avoid conflicting with repositories using pnpm.
-        mkdir slackify
-        cd slackify
-        npm init -y
     - name: Install slackify-markdown package
       shell: bash
-      working-directory: slackify
-      run: |
-        npm install slackify-markdown@4.3.1
+      run: npm install -g slackify-markdown@4.3.1
     - name: Slackify
       uses: actions/github-script@v6
       id: slackify
-      working-directory: slackify
       env:
         MARKDOWN: ${{ inputs.markdown }}
       with:
@@ -46,8 +37,4 @@ runs:
               core.setOutput('text', mrkdwn);
           } catch (error) {
               core.setFailed(error.message);
-          }
-    - name: Clean up slackify directory
-      shell: bash
-      run: |
-        rm -rf slackify
+          }