web and formatting fixes

- remove non-existent import InvokeAIWebConfig
- fix workflow file formatting
- clean up whitespace

.github/workflows/test-invoke-pip.yml

@@ -133,10 +133,10 @@ jobs:
           invokeai
           --no-patchmatch
           --no-nsfw_checker
-	  --precision=float32
-	  --always_use_cpu
+          --precision=float32
+          --always_use_cpu
           --outdir ${{ env.INVOKEAI_OUTDIR }}/${{ matrix.python-version }}/${{ matrix.pytorch }}
-	  < ${{ env.TEST_PROMPTS }}
+          < ${{ env.TEST_PROMPTS }}
 
       - name: Archive results
         id: archive-results