Add missing keywords

Also refactors structure of the page
to make the first section more useful.

doc/ci/README.md

@@ -12,7 +12,7 @@ description: "Learn how to use GitLab CI/CD, the GitLab built-in Continuous Inte
 CI/CD is a vast area, so GitLab provides documentation for all levels of expertise. Consult the following table to find the right documentation for you:
 
 | Level of expertise                  | Resource                                                                                                                              |
-|:------------------------------------|:------------------------------------------------------------------------------------------------------------------------------------------------------|
+|:------------------------------------|:--------------------------------------------------------------------------------------------------------------------------------------|
 | New to the concepts of CI and CD    | For a high-level overview, read an [introduction to CI/CD with GitLab](introduction/index.md).                                        |
 | Familiar with GitLab CI/CD concepts | After getting familiar with GitLab CI/CD, let us walk you through a simple example in our [quick start guide](quick_start/README.md). |
 | A GitLab CI/CD expert               | Jump straight to our [`.gitlab.yml`](yaml/README.md) reference.                                                                       |
@@ -26,7 +26,7 @@ the [Verify (CI)](../README.md#verify) and [Release (CD)](../README.md#release)
 The following documentation provides the minimum required knowledge for making use of GitLab CI/CD:
 
 | Topic                                                                               | Description                                                                                                     |
-|:------------------------------------------------------------------------|:---------------------------------------------------------|
+|:------------------------------------------------------------------------------------|:----------------------------------------------------------------------------------------------------------------|
 | [Getting started with GitLab CI/CD](quick_start/README.md)                          | Outlines the first steps for configuring GitLab CI/CD.                                                          |
 | [Introduction to pipelines and jobs](pipelines.md)                                  | Provides an overview of GitLab CI/CD and jobs.                                                                  |
 | [Configuration of your pipelines with `.gitlab-ci.yml`](yaml/README.md)             | A comprehensive reference for the `.gitlab-ci.yml` file.                                                        |