Update pip install command

Author: mahesh-panchal

.gitpod.yml

@@ -2,9 +2,7 @@ image: nfcore/gitpod:latest
 tasks:
   - name: install current state of nf-core/tools
     command: |
-      NFCORE_BUILD_PATH=$HOME/nf-core_build
-      pip install --upgrade -r requirements-dev.txt -e . -t $NFCORE_BUILD_PATH
-      PATH="$NFCORE_BUILD_PATH:$PATH"
+      python -m pip install --upgrade -r requirements-dev.txt -e .
 vscode:
   extensions: # based on nf-core.nf-core-extensionpack
     - codezombiech.gitignore                 # Language support for .gitignore files