Fix README and API Docs

Motivation:

The emojis in the README were not rendered consistently in the docs and on different screen form factors making a poor UX.

Modifications:

The CI config now properly sends the custom theme to Jazzy, and the README no longer has the `🔔` emoji in the disclaimer header.

Result:

A consistent UX with the README and proper API docs referring to GitLab

.gitlab-ci.yml

@@ -23,7 +23,7 @@ pages:
           --root-url "https://mordil.gitlab.io/swift-redis-nio-client/docs/RedisNIO" \
           --module "RedisNIO" \
           --module-version "$version" \
-          --theme fullwidth \
+          --theme docs/theme \
           --xcodebuild-arguments -scheme,swift-redis-nio-client-Package \
           --sourcekitten-sourcefile "./RedisNIO.json" \
           --output "./public"

README.md

@@ -1,4 +1,4 @@
-| :bell: The [GitHub repository](https://github.com/Mordil/swift-redis-nio-client) is a **read-only** mirror of the GitLab repository. For issues and merge requests, [please visit GitLab](https://gitlab.com/mordil/swift-redis-nio-client). :bell: |
+| The [GitHub repository](https://github.com/Mordil/swift-redis-nio-client) is a **read-only** mirror of the GitLab repository. For issues and merge requests, [please visit GitLab](https://gitlab.com/mordil/swift-redis-nio-client). |
 |---|
 
 [![License](https://img.shields.io/badge/License-Apache%202.0-yellow.svg)](./LICENSE.txt)