[Docs] Removed unused docs because they are moved to GitHub

docs/i18n_support.md

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-# ECMAScript 402
-
-V8 optionally implements the [ECMAScript 402](http://www.ecma-international.org/ecma-402/1.0/) API. The API is enabled by default, but can be turned off at compile time.
-
-
-## Prerequisites
-
-The i18n implementation adds a dependency on ICU. If you run
-
-```
-make dependencies
-```
-
-a suitable version of ICU is checked out into `third_party/icu`.
-
-
-### Alternative ICU checkout
-
-You can check out the ICU sources at a different location and define the gyp variable `icu_gyp_path` to point at the `icu.gyp` file.
-
-
-### System ICU
-
-Last but not least, you can compile V8 against a version of ICU installed in your system. To do so, specify the gyp variable `use_system_icu=1`. If you also have `want_separate_host_toolset` enabled, the bundled ICU will still be compiled to generate the V8 snapshot. The system ICU will only be used for the target architecture.
-
-
-## Embedding V8
-
-If you embed V8 in your application, but your application itself doesn't use ICU, you will need to initialize ICU before calling into V8 by executing:
-
-```
-v8::V8::InitializeICU();
-```
-
-It is safe to invoke this method if ICU was not compiled in, then it does nothing.
-
-
-## Compiling without i18n support
-
-To build V8 without i18n support use
-
-```
-make i18nsupport=off native
-```