Update pbx/README.adoc & use relative URL's (so readable offline)

roles/pbx/README.adoc

@@ -4,7 +4,7 @@
 
 https://internet-in-a-box.org[Internet-in-a-Box (IIAB)] can install https://asterisk.org/[Asterisk] and https://freepbx.org/[FreePBX] for Voice over IP (VoIP) calls using regular Android and iPhone softphone (SIP) apps — e.g. for low-cost and rural telephony.
 
-As of April 2022, IIAB installs https://wiki.asterisk.org/wiki/display/AST/Asterisk+19+Documentation[Asterisk 19] and https://www.freepbx.org/freepbx-16-is-now-released-for-general-availability/[FreePBX 16].
+As of May 2022, IIAB installs https://wiki.asterisk.org/wiki/display/AST/Asterisk+19+Documentation[Asterisk 19] and https://www.freepbx.org/freepbx-16-is-now-released-for-general-availability/[FreePBX 16].
 
 PHP 7.4 is REQUIRED (https://github.com/iiab/iiab/pull/2899[PR #2899]) and PHP 8.x does not yet work (https://github.com/iiab/iiab/pull/3019#issuecomment-962469346[PR #3109]) — so please consider installing this on https://github.com/iiab/iiab/wiki/IIAB-Platforms#operating-systems[Ubuntu 20.04, Debian 11, or Raspberry Pi OS 11 "Bullseye"].
 
@@ -55,7 +55,7 @@ Or, if you want to use FreePBX with Apache alone (http://box:83/freepbx), option
 pbx_use_nginx: False
 ----
 +
-If using PBX intensively, please adjust `/etc/php/X.Y/apache2/php.ini`, `/etc/php/X.Y/cli/php.ini` and/or `/etc/php/X.Y/nginx/php.ini` (where `X.Y` is typically 7.4) as outlined within https://github.com/iiab/iiab/blob/master/roles/www_options/tasks/main.yml#L88-L131[/opt/iiab/iiab/roles/www_options/tasks/main.yml] — some of which happens automatically if you also set:
+If using PBX intensively, please adjust `/etc/php/X.Y/apache2/php.ini`, `/etc/php/X.Y/cli/php.ini` and/or `/etc/php/X.Y/nginx/php.ini` (where `X.Y` is typically 7.4) as outlined within link:../www_options/tasks/main.yml#L86-L129[/opt/iiab/iiab/roles/www_options/tasks/main.yml] — some of which happens automatically if you also set:
 +
 ----
 nginx_high_php_limits: True
@@ -291,15 +291,15 @@ _If there's a bug or serious problem with IIAB, please do https://internet-in-a-
 
 . Apache's `/var/lib/php/asterisk_sessions/` directory might also be needed for NGINX?
 +
-If not, the https://github.com/iiab/iiab/blob/master/roles/pbx/tasks/freepbx.yml#L174-L186[configuration of /var/lib/php/asterisk_sessions/] might be made conditional upon `when: not pbx_use_apache`
+If not, the link:tasks/freepbx.yml#L175-L187[configuration of /var/lib/php/asterisk_sessions/] might be made conditional upon `when: not pbx_use_apache`
 
-. The https://github.com/iiab/iiab/blob/master/roles/pbx/tasks/freepbx.yml#L213-L220[installation of /etc/odbc.ini] for CDR (Call Detail Records) database `asteriskcdrdb` might benefit from compiling the ODBC driver for aarch64, per http://mghadam.blogspot.com/2021/03/install-asterisk-18-freepbx-15-on.html ?
+. The link:tasks/freepbx.yml#L214-L221[installation of /etc/odbc.ini] for CDR (Call Detail Records) database `asteriskcdrdb` might benefit from compiling the ODBC driver for aarch64, per http://mghadam.blogspot.com/2021/03/install-asterisk-18-freepbx-15-on.html ?
 +
 See the output of `asterisk -rx "cdr show status"` as mentioned at https://github.com/iiab/iiab/pull/2938#issuecomment-898693126[#2938] and https://github.com/iiab/iiab/pull/2942[PR #2942].
 
 . Raspberry Pi Zero W Warning
 +
-Node.js applications like Asterisk/FreePBX, Node-RED and Sugarizer won't work on Raspberry Pi Zero W (ARMv6) if you installed Node.js while on RPi 3, 3 B+ (ARMv7) or RPi 4 (ARMv8).  If necessary, run `apt remove nodejs` or `apt purge nodejs` then `rm /etc/apt/sources.list.d/nodesource.list; apt update` then (https://nodered.org/docs/hardware/raspberrypi#swapping-sd-cards[attempt!]) to https://github.com/iiab/iiab/blob/master/roles/nodejs/tasks/main.yml[install Node.js] _on the Raspberry Pi Zero W itself_ (a better approach than "cd /opt/iiab/iiab; ./runrole nodejs" is to try `apt install nodejs` or try installing the tar file mentioned at https://github.com/iiab/iiab/issues/2082#issuecomment-569344617[#2082]).  You might also need `apt install npm`.  Whatever versions of Node.js and npm you install, make sure `/etc/iiab/iiab_state.yml` contains the line `nodejs_installed: True` (add it if nec!)  Finally, proceed to install Asterisk/FreePBX, Node-RED and/or Sugarizer. https://github.com/iiab/iiab/issues/1799[#1799]
+Node.js applications like Asterisk/FreePBX, Node-RED and Sugarizer won't work on Raspberry Pi Zero W (ARMv6) if you installed Node.js while on RPi 3, 3 B+ (ARMv7) or RPi 4 (ARMv8).  If necessary, run `apt remove nodejs` or `apt purge nodejs` then `rm /etc/apt/sources.list.d/nodesource.list; apt update` then (https://nodered.org/docs/hardware/raspberrypi#swapping-sd-cards[attempt!]) to link:../nodejs/tasks/main.yml[install Node.js] _on the Raspberry Pi Zero W itself_ (a better approach than "cd /opt/iiab/iiab; ./runrole nodejs" is to try `apt install nodejs` or try installing the tar file mentioned at https://github.com/iiab/iiab/issues/2082#issuecomment-569344617[#2082]).  You might also need `apt install npm`.  Whatever versions of Node.js and npm you install, make sure `/etc/iiab/iiab_state.yml` contains the line `nodejs_installed: True` (add it if nec!)  Finally, proceed to install Asterisk/FreePBX, Node-RED and/or Sugarizer. https://github.com/iiab/iiab/issues/1799[#1799]
 
 
 ////