fix(tools): SEO descriptions

Author: mstephen19

content/academy/tools/edit_this_cookie.md

@@ -1,6 +1,6 @@
 ---
 title: EditThisCookie
-description: description
+description: Learn how to add, delete, and modify different cookies in your browser for testing purposes.
 menuWeight: 9.7
 paths:
     - tools/edit-this-cookie

content/academy/tools/quick_javascript_switcher.md

@@ -1,6 +1,6 @@
 ---
 title: Quick JavaScript Switcher
-description: description
+description: Discover a super simple tool for disabling JavaScript on a certain page to determine how it should be scraped. Great for detecting SPAs.
 menuWeight: 9.9
 paths:
     - tools/quick-javascript-switcher

content/academy/tools/user_agent_switcher.md

@@ -1,6 +1,6 @@
 ---
 title: User-Agent Switcher
-description: description
+description: Learn how to easily switch around your User-Agent header to different values to see how a certain site responds.
 menuWeight: 9.8
 paths:
     - tools/user-agent-switcher