E14: remove hardcoded local paths from the docs

Indicators-Overview.md referenced the absolute author-machine paths
D:\Coding\Wickra\crates\... and D:\Coding\Wickra\bindings\... in its
"Source-of-truth files" section, and seven trend-indicator pages had
Node examples that did require('D:/Coding/Wickra/bindings/node').

Replace the overview paths with repo-relative GitHub links and change
the Node examples to require('wickra'), the published npm package name
a reader would actually use. No D:/Coding path remains anywhere in docs.

docs/wiki/indicators/trend/Indicator-Ema.md

@@ -140,7 +140,7 @@ warmup_period: 3
 ### Node
 
 ```javascript
-const ta = require('D:/Coding/Wickra/bindings/node');
+const ta = require('wickra');
 const ema = new ta.EMA(3);
 for (const x of [1, 2, 3, 10]) {
   console.log(x, '->', ema.update(x));