General improvements to mobile instructions

* Using <details> and <summary> tags in the INSTALL.md to collapse the various platforms for installing, making the rendered page shorter and easier to read.
* Simplyfying the instructions for creating LND mobile
* Fixed bug in checkout of latest tagged release
* Fixed bug in command for moving proto definitions to same folder as xcframework file
* Use Go 1.17.6 for building the Swift proto definitions
* Added link to LND Builder’s Guide

docs/release-notes/release-notes-0.14.2.md

@@ -99,10 +99,14 @@ Postgres](https://github.com/lightningnetwork/lnd/pull/6111)
   history](https://github.com/lightningnetwork/lnd/pull/6180) by adding the `force`
   flag to the `XImportMissionControl` RPC call.
 
+## Documentation
+
+* [General improvements to the mobile documentation](https://github.com/lightningnetwork/lnd/pull/6181). 
 
 # Contributors (Alphabetical Order)
 
 * Andras Banki-Horvath
+* Andreas Schjønhaug
 * Bjarne Magnussen
 * Elle Mouton
 * Harsha Goli