go: re-do the entire thing

This is a mega-change, but attempting to split this up further is
probably not worth the effort.

Summary:

1. Bump up bazel, rules_go, and others.
2. Switch to new go target naming (bye bye go_default_library)
3. Move go deps to go.mod/go.sum, use make gazelle generate from that
4. Bump up Python deps a bit

And also whatever was required to actually get things to work - loads of
small useless changes.

Tested to work on NixOS and Ubuntu 20.04:

   $ bazel build //...
   $ bazel test //...

Change-Id: I8364bdaa1406b9ae4d0385a6b607f3e7989f98a9
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1583
Reviewed-by: q3k <q3k@hackerspace.pl>
diff --git a/hswaw/site/static/BUILD.bazel b/hswaw/site/static/BUILD.bazel
index 810d1a9..4da9c9e 100644
--- a/hswaw/site/static/BUILD.bazel
+++ b/hswaw/site/static/BUILD.bazel
@@ -4,21 +4,17 @@
 go_embed_data(
     name = "static",
     srcs = [
-        "fonts.css",
-        "landing.css",
-
         "animations.js",
-        "led.js",
-
+        "fonts.css",
         "frezarka.jpg",
         "kuka.jpg",
+        "landing.css",
+        "led.js",
         "neon-syrenka.svg",
         "serwerownia.jpg",
         "space.jpg",
+        "statut_warszawski_hackerspace-v1.3.pdf",
         "tokarka.jpg",
-
-	"statut_warszawski_hackerspace-v1.3.pdf",
-
         "@com_gstatic_fonts_comfortaa_400//file:font.ttf",
         "@com_gstatic_fonts_inconsolata_400//file:font.ttf",
         "@com_gstatic_fonts_inconsolata_700//file:font.ttf",