use sup rather than TeX
fix file extension to stop ssg from compiling the slides
add intro to python talk
update projects page
add fyne notes up to this poinrt
fix escape codes

(thanks Josh!)
add a signal-safe example to sigusr post
finalize SIGUSR1
fix broken newlines
add siguser draft
switch back to ssg3, since ssg5 breaks the site
add headalyzer to projects
Explicitly generate output files with gcc -o

Thanks James!
improve compatibility with updated lowdown version
fix rss, remove some links from the index

The linked posts aren't going away, but I think that they are either not
up to snuff in terms of quality, or are just no longer relevant. So I'm
removing them from the main site index. Deep links to those articles
will continue to be retained.
fix some formatting in Make guide