Update to reveal.js 4.6.1

Change-Id: I566737c50b93dd8c094ad3c3fa59865260b3b4ba
diff --git a/inst/reveal.js-4.6.1/.github/CONTRIBUTING.md b/inst/reveal.js-4.6.1/.github/CONTRIBUTING.md
new file mode 100644
index 0000000..bd0fab2
--- /dev/null
+++ b/inst/reveal.js-4.6.1/.github/CONTRIBUTING.md
@@ -0,0 +1,21 @@
+## Contributing
+Please keep the [issue tracker](https://github.com/hakimel/reveal.js/issues) limited to **bug reports**.
+
+
+### General Questions and Support
+If you have questions about how to use reveal.js the best place to ask is in the [Discussions](https://github.com/hakimel/reveal.js/discussions). Anything that isn't a bug report should be posted as a dicussion instead.
+
+
+### Bug Reports
+When reporting a bug make sure to include information about which browser and operating system you are on as well as the necessary steps to reproduce the issue. If possible please include a link to a sample presentation where the bug can be tested.
+
+
+### Pull Requests
+- Should be submitted from a feature/topic branch (not your master)
+- Should follow the coding style of the file you work in, most importantly:
+  - Tabs to indent
+  - Single-quoted strings
+
+
+### Plugins
+Please do not submit plugins as pull requests. They should be maintained in their own separate repository. More information here: https://github.com/hakimel/reveal.js/wiki/Plugin-Guidelines
diff --git a/inst/reveal.js-4.6.1/.github/FUNDING.yml b/inst/reveal.js-4.6.1/.github/FUNDING.yml
new file mode 100644
index 0000000..972831e
--- /dev/null
+++ b/inst/reveal.js-4.6.1/.github/FUNDING.yml
@@ -0,0 +1 @@
+github: [hakimel]
diff --git a/inst/reveal.js-4.6.1/.github/workflows/js.yml b/inst/reveal.js-4.6.1/.github/workflows/js.yml
new file mode 100644
index 0000000..af86bea
--- /dev/null
+++ b/inst/reveal.js-4.6.1/.github/workflows/js.yml
@@ -0,0 +1,27 @@
+name: tests
+
+on: [push]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [14.x]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: npm install
+    - run: npm run build --if-present
+    - run: npm test
+      env:
+        CI: true