Add linting+docs to GitHub Actions, fix docs

.github/workflows/ci.yml

@@ -0,0 +1,36 @@
+name: CI
+
+on: [push, pull_request]
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v2
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.8
+      - name: Install dependencies
+        run: python3.8 -m pip install nox
+      - name: Lint the code
+        run: nox -s lint
+
+  docs:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v2
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.8
+      - name: Install dependencies
+        run: python3.8 -m pip install nox
+      - name: Build documentation
+        run: nox -s docs

docs/source/reference/dataframe.rst

@@ -57,15 +57,15 @@ Function Application, GroupBy & Window
    DataFrameGroupBy.agg
    DataFrameGroupBy.aggregate
    DataFrameGroupBy.count
-   DataFrameGroupByGroupBy.mad
-   DataFrameGroupByGroupBy.max
-   DataFrameGroupByGroupBy.mean
-   DataFrameGroupByGroupBy.median
-   DataFrameGroupByGroupBy.min
-   DataFrameGroupByGroupBy.nunique
-   DataFrameGroupByGroupBy.std
-   DataFrameGroupByGroupBy.sum
-   DataFrameGroupByGroupBy.var
+   DataFrameGroupBy.mad
+   DataFrameGroupBy.max
+   DataFrameGroupBy.mean
+   DataFrameGroupBy.median
+   DataFrameGroupBy.min
+   DataFrameGroupBy.nunique
+   DataFrameGroupBy.std
+   DataFrameGroupBy.sum
+   DataFrameGroupBy.var
    GroupBy
 
 .. currentmodule:: eland