Removed the jekyll-footnotes plugin, which didn't work when published in one of the microsites

Signed-off-by: Dean Wampler <dean.wampler@ibm.com>

Author: deanwampler

GITHUB_PAGES.md

@@ -232,7 +232,7 @@ You don't have write permissions for the /Library/Ruby/Gems/2.6.0 directory.
 The commands run by `make setup-jekyll` include the following (a few details omitted for simplification):
 
 ```shell
-gem install bundler jekyll jekyll-footnotes jemoji
+gem install bundler jekyll jemoji
 bundle install
 bundle update html-pipeline
 ```

Gemfile

@@ -22,12 +22,11 @@ gem "minima", "~> 2.5"
 gem "github-pages", "~> 231", group: :jekyll_plugins
 
 # If you have any plugins, put them here!
-group :jekyll_plugins do
-  gem "jekyll-footnotes"
+# group :jekyll_plugins do
   # gem "jekyll-feed", "= 0.17.0"
   # gem "jekyll-feed", "= 0.15.1"
   # gem "jekyll-feed", "~> 0.12"
-end
+# end
 
 # Windows and JRuby does not include zoneinfo files, so bundle the tzinfo-data gem
 # and associated library.

docs/_config.yml

@@ -112,7 +112,6 @@ color_scheme: nil
 
 plugins:
   - jekyll-seo-tag
-  - jekyll/footnotes
   - jemoji
 
 kramdown:

docs/index.markdown

@@ -20,7 +20,7 @@ Welcome to the **The AI Alliance**: **MICROSITE_TITLE**.
 TODO - your "welcome" content
 
 
-This site is organized into the following sections{% fn %}:
+This site is organized into the following sections<sup>1</sup>:
 
 * [TODO - second top-level page]({{site.baseurl}}/second_page)
 * [TODO - nested]({{site.baseurl}}/nested/nested)
@@ -38,16 +38,7 @@ Additional links:
 | **Version** | **Date**   |
 | V0.1.0      | TIMESTAMP |
 
-<!--
-The Gemfile and _config.yaml add a footnotes plugin, which we used above ("{% fn %}"). Here are the footnotes.
-See: https://github.com/orangejulius/jekyll-footnotes 
--->
-
-{% footnotes %}
-   {% fnbody %}
-      <p>This is an example footnote. The numbering is automatic. See the [jekyll-footnotes](https://github.com/orangejulius/jekyll-footnotes){:target="jf"} site for more options.</p>
-   {% endfnbody %}
-{% endfootnotes %}
+<sup>1</sup> This is an example footnote.
 
 <!-- 
 Use the following construct to automatically show a table of