Remove PHP SSH

Not maintained.

Remove iniscan

Not maintained.

The book is outdated and no longer available

PHP Cookbook by Eric A. Mann

remove Boris REPL

Boris is outdated. Last commit: 9 years ago.
Use PsySH instead.

Created a separate category for PHP Conferences

Outdated

Remove `Nomad PHP` YouTube channel

Remove `Nomad PHP` YouTube channel as it is not updated and `nomadphp.com` website is also in the Web Sites section.

Added Bugsnag to Debugging / Profiling

* Create a separate category for error tracking services

Created a separate category for error tracking services and added several popular tools to it.

* Sort items

* Update table of contents

* Fix names

* Update README.md

add ddev and devilbox to development environment

* add docksal to Development Environment

* Update README.md

* Update README.md

* Change order

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Co-authored-by: Alexander Kartavenko <askemailbox@gmail.com>

Change `Elephant.io` url to the fork as the original repo is no longer maintained.

Change `wordpress.org` url to GitHub repo url as it makes workflow fail

Remove `Qafoo/QualityAnalyzer`

The project is not maintained.

Add PHP Magic Number Detector (`povils/phpmnd`)

Adds hollodotme/fast-cgi-client to list of event libraries

Added TCPDF PDF generation library.

Co-authored-by: Povilas Susinskas <povilas.susinskas@gmail.com>

Remove Goutte

This library is deprecated.

Add CrawlerDetect

Remove `7php.com`

Not updated.

Remove `phpversions.info`

This site is no longer maintained.