Rework PDF script (#3654)

scripts/pdf/README.md

@@ -11,22 +11,14 @@ This directory contains the script and related resources to generate a PDF copy
 ## Highlights
 
 - No LaTeX dependencies for generating the PDF.
-
-- 3 available color-schemes- *Basic*, *Solarized Light* and *Solarized Dark*. More can be added easily through CSS.
-
+- 3 available color-schemes: *Basic*, *Solarized Light* and *Solarized Dark*. More can be added easily through CSS.
 
 ## Requirements
 
-The PDF is generated by first converting the markdown files to HTML, and then rendering those HTML files as PDF. It depends on the following libraries:
+The PDF is generated by first converting the markdown files to HTML, and then rendering those HTML files as PDF. It depends on `markdown` and `weasyprint` libraries. To install the dependencies, run:
 
-#### Python-Markdown
+    pip3 install -r requirements.txt
 
-    pip3 install markdown
-    
-#### WeasyPrint
-
-    pip3 install WeasyPrint
-    
 Make sure OS specific dependencies for WeasyPrint are installed by following the instructions [here](http://weasyprint.readthedocs.io/en/latest/install.html).
 
 ## Usage
@@ -34,8 +26,8 @@ Make sure OS specific dependencies for WeasyPrint are installed by following the
 Generating the PDF is as simple as running
 
     python3 render.py <path-to-pages-directory> -c <color-scheme>
-    
-Complete information about the arguments can be viewed by running 
+
+Complete information about the arguments can be viewed by running
 
     python3 render.py --help
 
@@ -43,6 +35,3 @@ The color-schemes that can be specified are
 
 * `solarized-light`
 * `solarized-dark`
-
-    
-