add light/dark mode switch

docs/index.md

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+# Documentation for `seqproc`
+
+`seqproc` is a program for interpreting and transforming sequencing data 
+according to the extended fragment geometry description language (EFGDL). 
+In fact, currently, the `seqproc` executable is a rather thin wrapper around
+the underlying `seqproc` library, whose main purpose it to accept an input 
+stream of reads (consisting of single-end or paired-end reads) and an EFGDL
+specification, and to transform the input reads into the desired output format
+according to the specification.
+
+Thus, most of the important information regarding `seqproc` actually pertains 
+to the EFGDL, which has its own documentation. For detailed documentation 
+describing EFGDL, please visit the EFGDL specification documentation 
+[here](https://efgdl-spec.readthedocs.io/en/latest/).
+
+## Using `seqproc`
+
+The `seqproc` program is an executable that exposes a single command that takes 
+several command line arguments.  You can pass the `-h` or `--help` flag to `seqproc`
+to see the various command line arguments and their descriptions.
+
+    $ ./target/release/seqproc -h
+    General puprose sequence preprocessor
+
+    Usage: seqproc [OPTIONS] --geom <GEOM> --file1 <FILE1> --file2 <FILE2>
+
+    Options:
+      -g, --geom <GEOM>                 EFGDL string
+      -1, --file1 <FILE1>               r1 fastq file
+      -2, --file2 <FILE2>               r2 fastq file
+      -o, --out1 <OUT1>                 r1 out fastq file [default: ]
+      -w, --out2 <OUT2>                 r2 out fastq file [default: ]
+      -t, --threads <THREADS>           number of threads to use [default: 1]
+      -a, --additional <ADDITIONAL>...
+      -h, --help                        Print help
+
+

mkdocs.yml

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+site_name: Documentation for seqproc
+
+theme:
+  name: material
+  palette: 
+
+    # Palette toggle for light mode
+    - scheme: default
+      toggle:
+        icon: material/brightness-7 
+        name: Switch to dark mode
+
+    # Palette toggle for dark mode
+    - scheme: slate
+      toggle:
+        icon: material/brightness-4
+        name: Switch to light mode