Add information about navigator

Author: ehmicky

docs/7_system/hardware.md

@@ -8,6 +8,7 @@ Uptime, memory and CPUs can be retrieved on any OS using
 [`process.memoryUsage()`](https://nodejs.org/api/process.html#process_process_memoryusage),
 [`os.cpus()`](https://nodejs.org/api/os.html#os_os_cpus),
 [`os.availableParallelism()`](https://nodejs.org/api/os.html#osavailableparallelism),
+[`navigator.hardwareConcurrency`](https://nodejs.org/api/globals.html#navigatorhardwareconcurrency),
 [`process.cpuUsage()`](https://nodejs.org/api/process.html#process_process_cpuusage_previousvalue).
 and
 [`process.resourceUsage()`](https://nodejs.org/api/all.html#process_process_resourceusage).

docs/7_system/os_identification.md

@@ -23,6 +23,8 @@ identification methods but those are rarely needed:
   returns the CPU architecture, e.g. `arm` or `x64`.
 - [`os.endianness()`](https://nodejs.org/api/os.html#os_os_endianness) returns
   the CPU endianness, i.e. `BE` or `LE`.
+- [`navigator.platform`](https://nodejs.org/api/globals.html#navigatorplatform)
+  can also be used, which combines `process.platform` and `process.arch`.
 
 Some projects allow retrieving:
 

docs/summary.md

@@ -144,7 +144,8 @@
 
 ## 🎛️ [System](7_system/README.md)
 
-- Use [`os`](https://nodejs.org/api/os.html) Node.js core module when needed. If
+- Use [`os`](https://nodejs.org/api/os.html) Node.js core module and
+  [`navigator`](https://nodejs.org/api/globals.html#navigator) when needed. If
   it lacks some information, use
   [`systeminformation`](https://github.com/sebhildebrandt/systeminformation)
   instead.