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/basic/companies.md

@@ -0,0 +1,14 @@
+# Companies
+
+When exploring the [World](world.md), you can visit various companies.
+At these companies, you can apply for jobs.
+
+Working a job lets you earn money, experience, and [Reputation](reputation.md) with that company.
+
+While working for a company, you can click `Do something else simultaneously` to be able to do things while you continue to work in the background.
+There is a 20% penalty to the related gains.
+Clicking the `Focus` button under the overview will return you to the current work.
+
+If you've been hired to do a job you can click that `Apply for X Job` button again to get a promotion if you meet the requirements.
+You can see the requirements by hovering your cursor over the button.
+Higher positions give increased rewards.