added note 'custom website generation'

src/notes/custom-website-generation.gmi

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+# Custom Website Generation
+## Introduction
+I thought it would be interesting to discuss how I generate the static pages that you see on this website. Instead of using a pre-existing static site generator, I decided to make my own system, using common UNIX tools.
+
+## Content Writing
+First, I write the content in gemtext, allowing me to forget about styling. Since I am publishing to Gemini as well, Gemtext is more convenient then Markdown. The static pages shown to the public are generated using these source files.
+
+## Using make to build the website
+Then, I use make to generate the static pages. make only executes a recipe if the files it requires have been changed. I was inspired by Karl Bartel's use of make:
+=> https://www.karl.berlin/static-site.html Karl Bartel: 'make' as a Static Site Generator
+
+## Using awk to process the source files
+Most of the scripts run by make use awk, a language for processing text. I wrote some awk library scripts; I generally try to implement functions in awk, rather then execute programs, as the former is faster. I use mawk, since it's faster then gawk.
+
+The html.awk script converts a gemtext file to HTML.
+
+## Using git for tests
+I have make recipes for conducting tests, which take in input files at testing/input, and generate output files at testing/output. git-status will show any changes in output, and may allow me to find out potential errors. I was, once again, inspired by Karl:
+=> https://www.karl.berlin/testing-with-diff.html Karl Bartel: Simple Testing with 'git-diff'
+
+## Related
+=> http://git.vern.cc/techn0path/website