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/tools/gostatic/BUILD b/tools/gostatic/BUILD
index 13a250d..9ea52c7 100644
--- a/tools/gostatic/BUILD
+++ b/tools/gostatic/BUILD
@@ -5,4 +5,3 @@
     src = "@com_github_piranha_gostatic//:gostatic",
     visibility = ["//visibility:public"],
 )
-
diff --git a/tools/gostatic/example/BUILD b/tools/gostatic/example/BUILD
index cb54fec..bd41b18 100644
--- a/tools/gostatic/example/BUILD
+++ b/tools/gostatic/example/BUILD
@@ -2,10 +2,12 @@
 
 gostatic_tarball(
     name = "example",
-    templates = [
-        "site.tmpl",
+    srcs = [
+        "src/blog.atom",
+        "src/blog/first.md",
+        "src/index.html",
+        "src/static/style.css",
     ],
-    source_dir = "src",
     extra_config = """
 TITLE = Example Site
 URL = https://example.com
@@ -36,10 +38,8 @@
 	template page
 
     """,
-    srcs = [
-        "src/blog/first.md",
-        "src/static/style.css",
-        "src/blog.atom",
-        "src/index.html",
+    source_dir = "src",
+    templates = [
+        "site.tmpl",
     ],
 )
diff --git a/tools/gostatic/gomod-import-force.go b/tools/gostatic/gomod-import-force.go
new file mode 100644
index 0000000..b37a366
--- /dev/null
+++ b/tools/gostatic/gomod-import-force.go
@@ -0,0 +1,8 @@
+//go:build tools
+// +build tools
+
+package gostatic
+
+import (
+	_ "github.com/piranha/gostatic"
+)
diff --git a/tools/gostatic/tarify/BUILD.bazel b/tools/gostatic/tarify/BUILD.bazel
index 7bc841b..9a6dab5 100644
--- a/tools/gostatic/tarify/BUILD.bazel
+++ b/tools/gostatic/tarify/BUILD.bazel
@@ -1,15 +1,15 @@
 load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")
 
 go_library(
-    name = "go_default_library",
+    name = "tarify_lib",
     srcs = ["main.go"],
     importpath = "code.hackerspace.pl/hscloud/tools/gostatic/tarify",
     visibility = ["//visibility:private"],
-    deps = ["@com_github_golang_glog//:go_default_library"],
+    deps = ["@com_github_golang_glog//:glog"],
 )
 
 go_binary(
     name = "tarify",
-    embed = [":go_default_library"],
+    embed = [":tarify_lib"],
     visibility = ["//visibility:public"],
 )