docs: Added "LinkedIn Games Solver" to showcase (#2410)

Author: muhammedaksam

docs/assets/extension-showcase.yml

@@ -480,3 +480,7 @@
 
 - # WageSlav3
   chromeId: anhkcmapjhiiofpcgglfljphdgppilof
+
+- # LinkedIn Games Solver
+  chromeId: jnhgapnkejaijibcdhcldhdfikjmdaph
+  firefoxSlug: linkedin-games-solver-addon