docs: fixing docfx path (#83)

* adding api docs project structure

* fix path for source projects

* updated github actions to publish api docs

* adding docfx configuration to github actions

* fix docfx installation script

* fix docfx location

* persisting docfx in PATH

Author: t1agob

.github/workflows/docs.yml

@@ -32,7 +32,7 @@ jobs:
         run: |
           curl -LJO https://github.com/dotnet/docfx/releases/download/v2.56.7/docfx.zip 
           unzip docfx.zip -d /home/runner/work/aws-lambda-powertools-dotnet/aws-lambda-powertools-dotnet/docfx && rm docfx.zip
-          export PATH="/home/runner/work/aws-lambda-powertools-dotnet/aws-lambda-powertools-dotnet/docfx:$PATH"
+          echo "/home/runner/work/aws-lambda-powertools-dotnet/aws-lambda-powertools-dotnet/docfx" >> $GITHUB_PATH
       - name: Build api docs 
         run: |
           cd apidocs