docs: remove invalid tags backend and build from items

radar/2023-02-23/java.md

@@ -2,7 +2,7 @@
 title:      "Java"
 ring:       adopt
 quadrant:   languages-and-frameworks
-tags:       [coding, backend]
+tags:       [coding]
 ---
 
 [Java](https://www.java.com) is a versatile and widely-used programming language.

radar/2023-02-23/turborepo.md

@@ -2,7 +2,7 @@
 title:      "Turborepo"
 ring:       trial
 quadrant:   "tools"
-tags:       [build, frontend]
+tags:       [frontend]
 ---
 
 [Turborepo](https://turbo.build/repo) is a build system for JavaScript and TypeScript project,