Adds JavaScript roadmap (#1537)

* Add JavaScript roadmap project file

* Make way for JavaScript roadmap

* Add JavaScript roadmap on homepage

* Add JavaScript roadmap image

* Add content skeleton for javascript roadmap

* Fix flicker issue on javascript roadmap

* Fix broken build

content/roadmaps/110-java/content/102-java-build-tools/100-gradle.md

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+# Gradle

content/roadmaps/110-java/content/102-java-build-tools/101-maven.md

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+# Maven
+
+Maven is an open-source build tool, used primarily for Java projects.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='blue' badgeText='Official Site' href='https://maven.apache.org/guides/getting-started/'>Getting started</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://spring.io/guides/gs/maven/'>Building Java Projects with Maven</BadgeLink>

content/roadmaps/110-java/content/102-java-build-tools/102-ant.md

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+# Ant

content/roadmaps/110-java/content/102-java-build-tools/readme.md

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+# Java build tools