ICU-23055 Update outdated site.icu-project.org URLs.

Author: roubert

docs/_config.yml

@@ -59,7 +59,7 @@ aux_links:
   "ICU on GitHub":
     - "https://github.com/unicode-org/icu"
   "ICU Home Page":
-    - "http://site.icu-project.org/"
+    - "https://icu.unicode.org/"
   "Unicode Home Page":
     - "https://www.unicode.org"
 

docs/devsetup/java/ant/index.md

@@ -28,7 +28,7 @@ ICU4J source layout was changed after 4.2. There are several ways to set up the
 ICU4J development environment.
 
 Get the source code by following the [Quick Start
-instruction](http://site.icu-project.org/repository). Go into the icu4j/
+instruction](https://unicode-org.github.io/icu/devsetup/source/). Go into the icu4j/
 directory to see the build.xml file. You can run targets displayed by `ant -p`.
 
 Main targets:

icu4c/source/data/mappings/cns-11643-1992.ucm

@@ -33,7 +33,7 @@
 # This change keeps the converter available while significantly reducing
 # the size of the conversion table.
 # The previous version is available from the ICU charset repository.
-# See http://site.icu-project.org/charts/charset
+# See https://icu.unicode.org/charts/charset
 #
 <code_set_name>       "CNS-11643-1992"
 <char_name_mask>      "AXXXX"

tools/scripts/uconfig_vars_test.py

@@ -4,7 +4,7 @@
 """Executes uconfig variations check.
 
 See
-http://site.icu-project.org/processes/release/tasks/healthy-code#TOC-Test-uconfig.h-variations
+https://unicode-org.github.io/icu/processes/release/tasks/healthy-code.html#test-uconfigh-variations
 for more information.
 """
 

tools/unicode/py/preparseucd.py

@@ -1284,7 +1284,7 @@ def WritePreparsedUCD(out_file):
   for h in _h1: AddBoundary(h[0])
   for h in _h2: AddBoundary(h[0])
   # Write the preparsed data. ppucd.txt = preparsed UCD
-  # Syntax: http://site.icu-project.org/design/props/ppucd
+  # Syntax: https://unicode-org.github.io/icu/design/props/ppucd
   WriteFieldsRangeProps(["defaults"], 0, 0x10ffff, _defaults, out_file)
   i_blocks = 0
   i_alg = 0