website: pages: Get GNU Boot: add section about install parties.

While this mentions a previously held install party, it encourages
people to organize install parties and shows that they could be
mentioned on the GNU Boot website in some ways.

In addition it also explains the pros and cons of install parties.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
Acked-by: Adrien 'neox' Bourmault <neox@gnu.org>

website/pages/docs/install/index.md

@@ -30,6 +30,31 @@ project](../../contact.md): we are looking for information on the
 product being sold (flash chip size, customization, etc) to best
 support them.
 
+GNU Boot install parties
+========================
+
+Sometimes there are install parties that can help you install GNU Boot
+and/or install it for you on a computer supported by the install party
+(and GNU Boot).
+
+It can be cheaper than buying a computer with GNU Boot, but the
+install parties typically don't take care of everything.
+
+First you will obviously need to find a compatible computer and doing
+so without running nonfree software (like nonfree JavaScript) is
+complicated.
+
+Then install parties don't have replacement for batteries, WiFi cards
+to get WiFi that work with free software, etc, and they work with the
+hardware you bring to them. So if the hardware has defects they won't
+be able to fix it.
+
+Known install parties:
+
+* In May 2024 there was a GNU Boot install party at the Libreplanet
+  conference. Since this conference happens every year, you might want
+  to check next year(s) if there is a GNU Boot install party there.
+
 Upgrade yourself from an existing installation
 ==============================================