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/devtools/hackdoc/BUILD.bazel b/devtools/hackdoc/BUILD.bazel
index 186b0ef..d3c4eea 100644
--- a/devtools/hackdoc/BUILD.bazel
+++ b/devtools/hackdoc/BUILD.bazel
@@ -2,7 +2,7 @@
 load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")
 
 go_library(
-    name = "go_default_library",
+    name = "hackdoc_lib",
     srcs = [
         "helpers.go",
         "main.go",
@@ -11,30 +11,30 @@
     importpath = "code.hackerspace.pl/hscloud/devtools/hackdoc",
     visibility = ["//visibility:private"],
     deps = [
-        "//devtools/depotview/proto:go_default_library",
-        "//devtools/hackdoc/config:go_default_library",
-        "//devtools/hackdoc/source:go_default_library",
-        "//go/mirko:go_default_library",
-        "//go/pki:go_default_library",
-        "@com_github_gabriel_vasile_mimetype//:go_default_library",
-        "@com_github_golang_glog//:go_default_library",
-        "@in_gopkg_russross_blackfriday_v2//:go_default_library",
+        "//devtools/depotview/proto",
+        "//devtools/hackdoc/config",
+        "//devtools/hackdoc/source",
+        "//go/mirko",
+        "//go/pki",
+        "@com_github_gabriel_vasile_mimetype//:mimetype",
+        "@com_github_golang_glog//:glog",
+        "@com_github_russross_blackfriday_v2//:blackfriday",
         "@org_golang_google_grpc//:go_default_library",
     ],
 )
 
 go_binary(
     name = "hackdoc",
-    embed = [":go_default_library"],
+    embed = [":hackdoc_lib"],
     visibility = ["//visibility:public"],
 )
 
 container_layer(
     name = "layer_bin",
+    directory = "/devtools/",
     files = [
         ":hackdoc",
     ],
-    directory = "/devtools/",
 )
 
 container_image(
@@ -47,8 +47,8 @@
 
 container_push(
     name = "push",
-    image = ":runtime",
     format = "Docker",
+    image = ":runtime",
     registry = "registry.k0.hswaw.net",
     repository = "q3k/hackdoc",
     tag = "{BUILD_TIMESTAMP}-{STABLE_GIT_COMMIT}",