Fix status badge stuck on "Passing", hiding CI failures

Was previously failing Go package self-test due to incorrect version
spec syntax in a914513, which had "go-version: '1.20'" in test.yml.

Generate documentation including goat SVG output used only for that
purpose on GitHub.  SVG output in examples/ continues to be checked in,
for regression-testing purposes.

Don't attempt to run the build in Windows.

.github/workflows/make.yml

@@ -0,0 +1,39 @@
+name: Make
+
+on:
+  push:
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        go-version: [1.21.x]
+        os: [ubuntu-latest]
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - name: Install Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: ${{ matrix.go-version }}
+
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Make
+        run: ./make.sh
+
+      - name: Configure Git
+        run: |
+          git config --global user.name 'github-actions[bot]'
+          git config --global user.email 'github-actions[bot]@users.noreply.github.com'
+
+      - name: Commit and Push documentation
+        run: |
+	  git add README.md goat.svg trees.mid-blue.svg
+	  git commit -m 'Commit Github-generated documentation files'
+	  git push
+	env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

README.md.tmpl

@@ -1,7 +1,7 @@
 # GoAT: Go ASCII Tool
 
-<!-- Github-specific status icons-->
-![](https://github.com/github/docs/actions/workflows/test.yml/badge.svg)
+<!-- Github-specific status icon -->
+![](https://github.com/{{.GithubActor}}/goat/actions/workflows/make.yml/badge.svg)
 
 ## What **GoAT** Can Do For You
 
@@ -42,7 +42,7 @@ with rows above and below.
 
 ## Installation
 ```
-    $ go install github.com/{{.GithubUser}}/goat/cmd/goat@latest
+    $ go install github.com/{{.GithubActor}}/goat/cmd/goat@latest
 ```
 <!-- https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/organizing-information-with-collapsed-sections#creating-a-collapsed-section -->
 
@@ -133,12 +133,12 @@ The core engine of ```goat``` is accessible as a Go library package, for inclusi
 code of your own.
 The code implements a subset, and some extensions, of the ASCII diagram generation function of the browser-side Javascript in [Markdeep](http://casual-effects.com/markdeep/).
 
-A nicely formatted reference may be found at [pkg.go.dev](https://pkg.go.dev/github.com/{{.GithubUser}}/goat).
+A nicely formatted reference may be found at [pkg.go.dev](https://pkg.go.dev/github.com/{{.GithubActor}}/goat).
 
 ### Installation
 
 ```
-    $ go get -u github.com/{{.GithubUser}}/goat/
+    $ go get -u github.com/{{.GithubActor}}/goat/
 ```
 ### Library Data Flow
 ![]({{.Root}}/goat.svg)
@@ -150,13 +150,13 @@ source file [./goat.go](./goat.go).
 
 <!--
  XX XX  May need a Github Action to do this substitution at "push" time.
-[![resource non-responsive](https://pkg.go.dev/badge/github.com/{{.GithubUser}}/goat)](https://pkg.go.dev/github.com/{{.GithubUser}}/goat)
+[![resource non-responsive](https://pkg.go.dev/badge/github.com/{{.GithubActor}}/goat)](https://pkg.go.dev/github.com/{{.GithubActor}}/goat)
 -->
 
 <!--
  The scraping of GitHub by godocs.io (see https://sr.ht) does NOT include README.md;
  whereas Google's pkg.go.dev does do so, and apparently runs its own variant of GFM processing :-/ 
-[![resource non-responsive](https://godocs.io/github.com/{{.GithubUser}}/goat?status.svg)](https://godocs.io/github.com/{{.GithubUser}}/goat)
+[![resource non-responsive](https://godocs.io/github.com/{{.GithubActor}}/goat?status.svg)](https://godocs.io/github.com/{{.GithubActor}}/goat)
 -->
 
 ### Project Tenets