Fix false positives against catalog headers expressed with markdown i…

…nstead of html, at the cost of a very unreadable regular expression.

This matches the following header:
([![Community Plus header](https://github.com/newrelic/opensource-website/raw/main/src/images/categories/Community_Plus.png)](https://opensource.newrelic.com/oss-category/#community-plus)

In addition to the prior header:
<a href="https://opensource.newrelic.com/oss-category/#community-plus"><picture><source media="(prefers-color-scheme: dark)" srcset="https://github.com/newrelic/opensource-website/raw/main/src/images/categories/dark/Community_Plus.png"><source media="(prefers-color-scheme: light)" srcset="https://github.com/newrelic/opensource-website/raw/main/src/images/categories/Community_Plus.png"><img alt="New Relic Open Source community plus project banner." src="https://github.com/newrelic/opensource-website/raw/main/src/images/categories/Community_Plus.png"></picture></a>

Apologies to future devs who have to strain their eyes to read the regular expression. It is fundamentally (A)|(B), where the contents of A and B are escaped.

repolinter-rulesets/community-plus.yml

@@ -52,8 +52,7 @@ rules:
         nocase: true
         lineCount: 5
         patterns:
-          - '<a href="https:\/\/opensource\.newrelic\.com\/oss-category\/#community-plus"><picture><source media="\(prefers-color-scheme: dark\)" srcset="https:\/\/github\.com\/newrelic\/opensource-website\/raw\/main\/src\/images\/categories\/dark\/Community_Plus\.png"><source media="\(prefers-color-scheme: light\)" srcset="https:\/\/github\.com\/newrelic\/opensource-website\/raw\/main\/src\/images\/categories\/Community_Plus\.png"><img alt="New Relic Open Source community plus project banner\." src="https:\/\/github\.com\/newrelic\/opensource-website\/raw\/main\/src\/images\/categories\/Community_Plus\.png"><\/picture><\/a>'
-          - https:\/\/opensource\.newrelic\.com\/oss-category\/#community-plus
+	  -(<a href="https:\/\/opensource\.newrelic\.com\/oss-category\/#community-plus"><picture><source media="\(prefers-color-scheme: dark\)" srcset="https:\/\/github\.com\/newrelic\/opensource-website\/raw\/main\/src\/images\/categories\/dark\/Community_Plus\.png"><source media="\(prefers-color-scheme: light\)" srcset="https:\/\/github\.com\/newrelic\/opensource-website\/raw\/main\/src\/images\/categories\/Community_Plus\.png"><img alt="New Relic Open Source community plus project banner\." src="https:\/\/github\.com\/newrelic\/opensource-website\/raw\/main\/src\/images\/categories\/Community_Plus\.png"><\/picture><\/a>)|(\(\[\!\[Community Plus header\]\(https\:\/\/github\.com\/newrelic\/opensource\-website\/raw\/main\/src\/images\/categories\/Community_Plus\.png\)\]\(https\:\/\/opensource\.newrelic\.com\/oss\-category\/\#community\-plus\))
         human-readable-pattern: Open source Community Plus header (see https://opensource.newrelic.com/oss-category)
         flags: i
         succeed-on-non-existent: false