implement live-reloading dev server

Squashed commit of the following:

commit 02f077432202af4d633eb2cad81dfdaa6921317f
Author: Alan Pearce <alan@alanpearce.eu>
Date:   Sat Apr 27 21:09:14 2024 +0200

    builder: only remove output directory if set and in dev mode

commit 47001e01c55fa6e74aafeda04ebc3e4e7c47eba0
Author: Alan Pearce <alan@alanpearce.eu>
Date:   Sat Apr 27 21:03:37 2024 +0200

    implement live reload on dev server

commit 411ec969f61e4b73439f1c54ea29f75135ecc618
Author: Alan Pearce <alan@alanpearce.eu>
Date:   Sat Apr 27 20:59:26 2024 +0200

    server: implement graceful shutdown

commit 5400132eb6eb1b638e0b3fd4265f51611c92d473
Author: Alan Pearce <alan@alanpearce.eu>
Date:   Sat Apr 27 20:41:07 2024 +0200

    add some debug logs

commit 3c9b678197c044603950232d222f501ef74d7873
Author: Alan Pearce <alan@alanpearce.eu>
Date:   Sat Apr 27 20:39:09 2024 +0200

    prefix log output with executable name

commit 300e24c179e390e9d3f5aeab4471c97f17f1fa64
Author: Alan Pearce <alan@alanpearce.eu>
Date:   Sat Apr 27 20:29:42 2024 +0200

    don't panic inside internal packages, return error instead

commit fe2715d330402ad67fe866471bed89c7238ad2ec
Author: Alan Pearce <alan@alanpearce.eu>
Date:   Fri Apr 26 01:18:29 2024 +0200

    config: use a table to configure CSP headers

commit d012553aaf78a436fa8871830b5d720a9e292d4b
Author: Alan Pearce <alan@alanpearce.eu>
Date:   Thu Apr 25 17:13:39 2024 +0200

    dev: create basic dev server to build and serve from a temporary directory

commit a1d11d3e69650d9b43ca1b1d7b7ccc05a808d5c1
Author: Alan Pearce <alan@alanpearce.eu>
Date:   Thu Apr 25 13:02:22 2024 +0200

    remove unused redirect_other_hostnames config option

commit fd67b19b5c7f76f0c3579e8a05ef20a618e90be7
Author: Alan Pearce <alan@alanpearce.eu>
Date:   Thu Apr 25 12:58:53 2024 +0200

    server: make port a string, which is what go uses

commit c798e8e736c0649008cade337158399470a9099b
Author: Alan Pearce <alan@alanpearce.eu>
Date:   Thu Apr 25 12:58:33 2024 +0200

    config: remove unused port variable

commit f94882b9001f3b0855e26b26b4a84b96e3deb22b
Author: Alan Pearce <alan@alanpearce.eu>
Date:   Thu Apr 25 12:49:10 2024 +0200

    re-organise module layout

1 files changed, 25 insertions, 2 deletions

diff --git a/config.toml b/config.toml
index 603c8d3..55b2508 100644
--- a/config.toml
+++ b/config.toml
@@ -1,6 +1,5 @@
 default_language = "en-GB"
 base_url = "https://alanpearce.eu"
-redirect_other_hostnames = true
 
 title = "Alan Pearce"
 email = "alan@alanpearce.eu"
@@ -13,10 +12,34 @@ original_domain = "alanpearce.eu"
 name = "tags"
 feed = true
 
+[content-security-policy]
+default-src = [
+  "'none'",
+]
+image-src = [
+  "'self'",
+  "http://gc.zgo.at",
+]
+script-src = [
+  "'self'",
+  "http://gc.zgo.at",
+]
+style-src = [
+  "'unsafe-inline'",
+]
+frame-ancestors = [
+  "https://kagi.com",
+]
+connect-src = [
+  "https://alanpearce-eu.goatcounter.com/count",
+]
+require-trusted-types-for = [
+  "'script'",
+]
+
 [extra.headers]
 cache-control = "max-age=14400"
 x-content-type-options = "nosniff"
-content-security-policy = "default-src 'none'; img-src 'self' https://gc.zgo.at; script-src 'self' https://gc.zgo.at; style-src 'unsafe-inline'; frame-ancestors https://kagi.com; connect-src https://alanpearce-eu.goatcounter.com/count; require-trusted-types-for 'script'"
 
 [[menus.main]]
     name = "Home"