feat: enable i18n

[molant]

Integrate with Crowdin to download the latest translations and generate
the site for the supported locales.

---

Fix #64

[molant]

This supersedes #64 and should be easier to review.

[ckerr]

I had a few questions inline -- some were optional changes, some were just questions I had to get familiar with the code -- but overall LGTM. No blockers.

[ckerr]

out-of-scope for this PR, but if adding fs-extra, the del dependency can be removed

[molant]

I need to review when I'm deleting folders. I know that I liked it because it accepts globby patterns and then I could use .gitignore to clean all the files in the prebuild step but in this new PR it might not be needed.

[molant]

The current build failures on Heroku are because of incorrect markdown being downloaded from Crowdin. I'll try to fix all of those before I'm on vacation 🏖

[molant]

Build is failing now with the following message 😭

<--- Last few GCs --->
[4227:0x5f7aa80]  2083570 ms: Scavenge 2500.6 (2581.1) -> 2489.8 (2581.6) MB, 21.5 / 0.0 ms  (average mu = 0.315, current mu = 0.348) allocation failure 
[4227:0x5f7aa80]  2083755 ms: Scavenge 2503.7 (2581.6) -> 2493.1 (2582.6) MB, 24.5 / 0.0 ms  (average mu = 0.315, current mu = 0.348) allocation failure 
[4227:0x5f7aa80]  2087361 ms: Mark-sweep 2506.1 (2582.6) -> 2474.2 (2581.8) MB, 3465.3 / 0.1 ms  (average mu = 0.335, current mu = 0.354) allocation failure scavenge might not succeed
<--- JS stacktrace --->
FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory
 1: 0xa24ed0 node::Abort() [/tmp/build_36b48d1b/.heroku/node/bin/node]
 2: 0x966115 node::FatalError(char const*, char const*) [/tmp/build_36b48d1b/.heroku/node/bin/node]
 3: 0xb9acde v8::Utils::ReportOOMFailure(v8::internal::Isolate*, char const*, bool) [/tmp/build_36b48d1b/.heroku/node/bin/node]
 4: 0xb9b057 v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, bool) [/tmp/build_36b48d1b/.heroku/node/bin/node]
 5: 0xd56ea5  [/tmp/build_36b48d1b/.heroku/node/bin/node]
 6: 0xd57a2f  [/tmp/build_36b48d1b/.heroku/node/bin/node]
 7: 0xd65abb v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) [/tmp/build_36b48d1b/.heroku/node/bin/node]
 8: 0xd6967c v8::internal::Heap::AllocateRawWithRetryOrFailSlowPath(int, v8::internal::AllocationType, v8::internal::AllocationOrigin, v8::internal::AllocationAlignment) [/tmp/build_36b48d1b/.heroku/node/bin/node]
 9: 0xd37d2b v8::internal::Factory::NewFillerObject(int, bool, v8::internal::AllocationType, v8::internal::AllocationOrigin) [/tmp/build_36b48d1b/.heroku/node/bin/node]
10: 0x108035f v8::internal::Runtime_AllocateInYoungGeneration(int, unsigned long*, v8::internal::Isolate*) [/tmp/build_36b48d1b/.heroku/node/bin/node]
11: 0x1427079  [/tmp/build_36b48d1b/.heroku/node/bin/node]
Aborted
error Command failed with exit code 134.

[molant]

We might need to build the languages one by one. There might be some leaking using the regular build command 🤔
Also the build takes forever (5-6min per language).

[molant]

Closing in favor of #112

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