Tidy up structure of briefcase

I had a spare fifteen minutes and decided that I should tidy up my
monorepo. The work of tidying up is not finished; this is a small step in the
right direction.

TL;DR
- Created a tools directory
- Created a scratch directory (see README.md for more information)
- Added README.md to third_party
- Renamed delete_dotfile_symlinks -> symlinkManager
- Packaged symlinkManager as an executable symlink-mgr using buildGo

scratch/deepmind/part_two/todo.org

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+* Array and string manipulation
+** TODO Merging Meeting Times
+** DONE Reverse String in Place
+** TODO Reverse Words
+** TODO Merge Sorted Arrays
+** TODO Cafe Order Checker
+* Hashing and hash tables
+** TODO Inflight Entertainment
+** TODO Permutation Palindrome
+** TODO Word Cloud Data
+** TODO Top Scores
+* Greedy Algorithms
+** TODO Apple Stocks
+** TODO Highest Product of 3
+** TODO Product of All Other Numbers
+** TODO Cafe Order Checker
+** TODO In-Place Shuffle
+* Sorting, searching, and logarithms
+** TODO Find Rotation Point
+** TODO Find Repeat, Space Edition
+** TODO Top Scores
+** TODO Merging Meeting Times
+* Trees and graphs
+** TODO Balanced Binary Tree
+** TODO Binary Search Tree Checker
+** TODO 2nd Largest Item in a Binary Search Tree
+** TODO Graph Coloring
+** TODO MeshMessage
+** TODO Find Repeat, Space Edition BEAST MODE
+* Dynamic programming and recursion
+** TODO Recursive String Permutations
+** TODO Compute nth Fibonacci Number
+** TODO Making Change
+** TODO The Cake Thief
+** TODO Balanced Binary Tree
+** TODO Binary Search Tree Checker
+** TODO 2nd Largest Item in a Binary Search Tree
+* Queues and stacks
+** TODO Largest Stack
+** TODO Implement A Queue With Two Stacks
+** TODO Parenthesis Matching
+** TODO Bracket Validator
+* Linked lists
+** DONE Delete Node
+** TODO Does This Linked List Have A Cycle?
+** TODO Reverse A Linked List
+** TODO Kth to Last Node in a Singly-Linked List
+** TODO Find Repeat, Space Edition BEAST MODE
+* System design
+** TODO URL Shortener
+** TODO MillionGazillion
+** TODO Find Duplicate Files
+* General programming
+** TODO Rectangular Love
+** TODO Temperature Tracker
+* Bit manipulation
+** TODO Binary Numbers
+** TODO The Stolen Breakfast Drone
+* Combinatorics, probability, and other math
+** TODO Which Appears Twice
+** TODO Find in Ordered Set
+** TODO In-Place Shuffle
+** TODO Simulate 5-sided die
+** TODO Simulate 7-sided die
+** TODO Two Egg Problem
+* JavaScript
+** TODO JavaScript Scope
+** TODO What's Wrong with This JavaScript?
+* Coding interview tips
+** TODO How The Coding Interview Works
+** TODO General Coding Interview Advice
+** TODO Impostor Syndrome
+** TODO Why You Hit Dead Ends
+** TODO Tips for Getting Unstuck
+** TODO The 24 Hours Before Your Interview
+** TODO Beating Behavioral Questions
+** TODO Managing Your Interview Timeline