[gimp-web-devel/pat/bootstrap] content: add some links to old plug-in development tutorials.

[Jehan <jehanp src gnome org>]

commit c91aea5ec23a631260dc194e1ebb2500aa658fc0
Author: Jehan <jehan girinstud io>
Date:   Thu Sep 22 22:26:07 2022 +0200

    content: add some links to old plug-in development tutorials.
    
    These links were listed in the bottom of https://www.gimp.org/docs/ which we are
    now trying to clean up.
    I hesitated to keep the "GIMP Script-Fu changes in GIMP 2.4" document as it is
    also listed in the GIMP 2.4 release notes, as well as in one of the legacy
    tutorials "Basic Scheme 2". I still kept it here. Anyway I kept everything in an
    "Historical Documentation" section with clear message about all these links
    being outdated.
    
    Finally there was also a "GIMP Script-Fu documentation" supposed to be at
    https://www.gimp.org/docs/scheme_plugin/, but the link is now dead. It looks
    like this content may have not been salvaged during the 2015 website migration
    since I can find it in the file-list meta page. I guess it was just never ported
    over. Anyway it is not useful to keep dead links.

 content/resource/writing-a-plug-in/_index.md | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
---
diff --git a/content/resource/writing-a-plug-in/_index.md b/content/resource/writing-a-plug-in/_index.md
index a2a13cf..7c47501 100644
--- a/content/resource/writing-a-plug-in/_index.md
+++ b/content/resource/writing-a-plug-in/_index.md
@@ -3,10 +3,31 @@ title = "How to write a plug-in for GIMP 2.10"
 description = "Writing GIMP 2.10 plug-ins"
 date = "2022-07-20"
 weight = 2
+show_subs = false
 +++
 
+ℹ️  *The various documents listed below may not be very up-to-date. In particular,
+you will not find documentation for the upcoming v3.0 API and plug-in creation
+tutorials. We are currently in the process of rebuilding proper plug-in
+developer documentation. With a bit of patience, this will soon contain
+up-to-date information.* ⏳
+
 Make good use of the [GIMP 2.0 API reference](/api/2.0),
 and you can also have a look at a talk about
 [GIMP plug-in programming](http://www.home.unix-ag.org/simon/gimp/guadec2002/gimp-plugin/html)
 that Simon gave at GUADEC in Sevilla.
 
+
+* [How to write a GIMP plug-in, part I](1/)
+* [How to write a GIMP plug-in, part II](2/)
+* [How to write a GIMP plug-in, part III](3/)
+
+## Historical documentation
+
+For historical purpose, you may also be interested into the below older
+tutorials. Note that their contents may be quite outdated, yet are kept as
+archive of the evolution of GIMP plug-in infrastucture.
+
+* [Writing a GIMP Plug-In](http://gimp-plug-ins.sourceforge.net/doc/Writing/html/plug-in.html) by Kevin 
Turner for GIMP 1.x series (2000).
+* [GIMP Python module Documentation](https://www.gimp.org/docs/python/index.html) by James Henstridge (1999)
+* [GIMP Script-Fu changes in GIMP 2.4 (migration guide)](https://www.gimp.org/docs/script-fu-update.html)