docs: add encodeURIComponent, replace handlebars helpers (#12672)

docs/usage/templates.md

@@ -37,6 +37,27 @@ If you want to print pretty JSON with Handlebars you can use the built-in functi
 
 In the example above `myvar` is a variable/field, that contains valid JSON.
 
+### encodeURIComponent
+
+If you want to convert a string to a valid URI, use the built-in function `encodeURIComponent` like this:
+
+`{{{encodeURIComponent baseDir}}}`
+
+In the example above `baseDir` is the string you want to transform into a valid URI.
+
+Read the [MDN Web Docs, encodeURIComponent()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent) to learn more.
+
+### replace
+
+The `replace` helper replaces _all_ found strings with the replacement string.
+If you want to replace some characters in a string, use the built-in function `replace` like this:
+
+`{{{replace 'github.com', 'ghc', depName}}}`
+
+In the example above all matches of `github.com` will be replaced by `ghc` in `depName`.
+
+Read the [MDN Web Docs, String.prototype.replace()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace) to learn more.
+
 ### containsString
 
 Returns `true` if a given string is a substring.