DOC: Move all docs into en/ subdirectory (#1505)

* DOC: Move all docs into en/ subdirectory

PR #1502 is working on adding a Chinese translation to the docs. In
general, I encouraged this (in #1452) as a path towards getting useful
translated content in the game without requiring a massive
refactor/rearchitecting of everything.

To support this, this takes the first step of moving our docs into an
en/ subdirectory, so that other languages can live alongside. No effort
is made at this time to support or select between alternate languages;
this is a pure-rename refactor.

src/Documentation/doc/en/migrations/v2.md

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+# v2.0.0 Migration Guide
+
+In v2.0.0 a few more APIs have been broken.
+
+## Working
+
+Working has been rebuilt from the ground up. The motivation for this change is that all
+different types of work all required different cached variables on the main Player object.
+This caused a lot of bugs and crashes. It's been reworked in such a way as to prevent bugs
+and make it nearly trivial to add new kinds of work.
+All work types give their reward immediately. No need to stop work to bank rewards like reputation.
+Faction and Company work no longer have a time limit.
+Company work no longer reduces rep gain by half for quitting early.
+Company factions now require 400k rep to join (up from 200k).
+Backdooring a company server reduces faction requirement to 300k.
+All types of work generally no longer keep track of cumulative gains like exp and reputation since it's applied instantly.
+
+## commitCrime
+
+Crime now loops, meaning after finishing one shoplift you start the next one with no input. While the signature
+has not changed, its behavior has. It also has a new 'focus' parameter.
+
+## getPlayer
+
+The following work-related fields are no longer included:
+
+- workChaExpGained
+- currentWorkFactionName
+- workDexExpGained
+- workHackExpGained
+- createProgramReqLvl
+- workStrExpGained
+- companyName
+- crimeType
+- workRepGained
+- workChaExpGainRate
+- workType
+- workStrExpGainRate
+- isWorking
+- workRepGainRate
+- workDefExpGained
+- currentWorkFactionDescription
+- workHackExpGainRate
+- workAgiExpGainRate
+- workDexExpGainRate
+- workMoneyGained
+- workMoneyLossRate
+- workMoneyGainRate
+- createProgramName
+- workDefExpGainRate
+- workAgiExpGained
+- className
+
+The reason for this, is that these fields are all, in one way or another, included in the new work field `currentWork`.
+Some of these values are also irrelevant.
+Take a look at the new singularity.getCurrentWork function:
+
+All fields ending in `_mult` have been moved to the `mults` struct.
+For example: `getPlayer().hacking_skill_mult` => `getPlayer().mults.hacking_skill`
+
+skills has been moved to the skills struct
+For example: `getPlayer().hacking` => `getPlayer().skills.hacking`
+
+exp has been moved to the exp struct
+For example: `getPlayer().hacking_exp` => `getPlayer().exp.hacking`
+
+hp has been moved to the hp struct
+For example: `getPlayer().max_hp` => `getPlayer().hp.max` or `hp.current`
+
+`hasWseAccount`, `hasTixApiAccess`, `has4SData`, `has4SDataTixApi` have been removed and replaced with similar stock functions.
+
+## workForCompany
+
+The argument 'companyName' is now required.
+
+## getScriptIncome & getScriptExpGain
+
+These two functions used to have a call where, if no arguments were provided, it would return the total for all scripts. This caused weird signature.
+If you want to get the total income/exp for all scripts, use the new getTotalScriptIncome / getTotalScriptExpGain instead.
+
+## scp
+
+The last two arguments of scp have been reversed. The signature is now scp(files, destination, optional_source)
+
+## Singularity
+
+The top level singularity functions were deprecated a while ago in favor of the singularity namespace.
+This means calls like 'ns.connect' need to be changed to 'ns.singularity.connect'
+
+## stock.buy, stock.sell, stock.short
+
+These functions were renamed to stock.buyStock, stock.sellStock, and stock.buyShort because 'buy', 'sell', and 'short'
+are very common tokens that would trick the ram calculation.
+
+## corporation.bribe
+
+The ability to give shares as a bribe has been removed. The signature is now bribe(faction, money)