change some alert levels to error

Author: rosieyohannan

styles/AsciiDoc/ImageContainsAltText.yml

@@ -1,7 +1,7 @@
 ---
 extends: existence
 scope: raw
-level: warning
+level: error
 link: https://redhat-documentation.github.io/supplementary-style-guide/#cloud-services-images
 message: "Image is missing accessibility alt tags."
 raw:

styles/AsciiDoc/LinkContainsLinkText.yml

@@ -1,7 +1,7 @@
 ---
 extends: existence
 scope: raw
-level: warning
+level: error
 ignorecase: true
 nonword: true
 link: https://redhat-documentation.github.io/supplementary-style-guide/#cloud-services-links-hypertext

styles/circleci-docs/ImageTitles.yml

@@ -1,7 +1,7 @@
 ---
 extends: script
 scope: raw
-level: warning
+level: error
 message: "Images should have a title (line starting with '.' before the image)."
 link: https://github.com/circleci/circleci-docs
 script: |

styles/circleci-docs/PageDescriptionLength.yml

@@ -1,7 +1,7 @@
 ---
 extends: script
 scope: raw
-level: warning
+level: error
 message: "Page description should not exceed 160 characters for SEO."
 link: https://github.com/circleci/circleci-docs
 script: |

styles/circleci-docs/PageTitleLength.yml

@@ -3,6 +3,6 @@ extends: existence
 message: "Page title should not exceed 60 characters."
 link: https://github.com/circleci/circleci-docs
 scope: heading.h1
-level: warning
+level: error
 tokens:
   - '.{61,}'

styles/circleci-docs/XrefTitleCase.yml

@@ -1,7 +1,7 @@
 ---
 extends: script
 scope: raw
-level: warning
+level: error
 message: "Use title case for xref link text."
 link: https://github.com/circleci/circleci-docs
 script: |