docs: Update font installation instructions

Update font installation instructions to use xml2rfc-fonts repository.

Fixes #1030

README.md

@@ -45,15 +45,9 @@ In order to generate PDFs, **xml2rfc** uses the [WeasyPrint] module, which depen
 pip install 'weasyprint==55.0'
 ```
 3. Finally, install the full **Noto Font** and **Roboto Mono** packages:
-  * Download the full font file from:
-    https://noto-website-2.storage.googleapis.com/pkgs/Noto-unhinted.zip
-  * Follow the installation instructions at
-    https://www.google.com/get/noto/help/install/
-  * Go to https://fonts.google.com/specimen/Roboto+Mono, and download the
-    font. Follow the installation instructions above, as applied to this download.
-  * Go to https://fonts.google.com/noto/specimen/Noto+Sans+Math, and
-    download the font. Follow the installation instructions above, as
-    applied to this download.
+  * Download the latest xml2rfc-fonts release from:
+    https://github.com/ietf-tools/xml2rfc-fonts/releases
+  * Follow the fonts installation instructions for your operating system.
 
 With these installed and available to **xml2rfc**, the `--pdf` switch will be enabled.
 

xml2rfc/run.py

@@ -89,25 +89,13 @@ def get_pdf_help(missing_libs=""):
 
         pip install 'weasyprint>=53.0,!=57.0,!=60.0'
 
-
     3. Finally, install the full Noto Font and Roboto Mono packages:
 
-       * Download the full font file from:
-         https://noto-website-2.storage.googleapis.com/pkgs/Noto-unhinted.zip
-         or follow the 'DOWNLOAD ALL FONTS' link on this page:
-         https://www.google.com/get/noto/
-
-       * Follow the installation instructions at
-         https://www.google.com/get/noto/help/install/
+       * Download the latest xml2rfc-fonts release from:
+         https://github.com/ietf-tools/xml2rfc-fonts/releases
 
-       * Go to https://fonts.google.com/specimen/Roboto+Mono, and download the
-         font. Follow the installation instructions above, as applied to this
-         download.
+       * Follow the fonts installation instructions for your operating system.
 
-       * Go to https://fonts.google.com/noto/specimen/Noto+Sans+Math, and
-         download the font. Follow the installation instructions above, as
-         applied to this download.
-    
     With these libraries, modules, and fonts installed and available to
     xml2rfc, the --pdf switch will be enabled.
     """