Compute stats (#196)

* Rewrote `supportedChars` function, fix many bugs.

* Rewrote the `computeDigrams` function.

* Fixed minor bug.

* Slightly better names.

* Rewrote the `computeTrigrams` function.

* Merged `computeDigrams` and `computeTrigrams`.

* bugfix: Removed extra unnecessary computations.

* bugfix: prioritise 1DK over any other dead key.

* Dumb bug fixes.

* Simpler ngrams structure.

* Fixed ngrams that uses a deadKey + normalization.

* Fixed bad redirects.

* Fixed layouts with deadKeys, but no ODK.

* "Some code repetition is fine, actually..."

* Fixed ISRT.

* Corretly handles deadKeys when naming the ngrams.

* Fixed normalization when characters are missing.

* Reverted the extra digit of precision on trigrams.

* Replaced all `==`/`!=` with a sed command.

* Better documentation.

* Ngram categories are now a global variable.

* You saw nothing.

code/collapsable-table.js

@@ -104,6 +104,7 @@ class CollapsableTable extends HTMLElement {
       `<tr><th colspan='2'>${title}</td></tr>` +
       Object.entries(values)
         .filter(([digram, freq]) => freq >= 10 ** -precision)
+        .sort(([_, freq1], [__, freq2]) => freq2 - freq1)
         .map(
           ([digram, freq]) =>
             `<tr><td>${digram}</td><td>${freq.toFixed(precision)}</td></tr>`,