feat: release notes for 0.1.9; NetSurf license notices; bump version to 0.2.0

Cut two 0.1.9 x86_64 images: montauk-0.1.9-x86_64.iso (29 MB) and
montauk-0.1.9-sdk-x86_64.iso (194 MB). Both include the NetSurf port and
exclude the WIP git port; only the SDK image carries 0:/sdk.

GNUmakefile: add RELEASE_WITHOUT_SDK=1 to the release target, mirroring
RELEASE_WITH_PORTS. Needed because devkit is .PHONY and repopulates
programs/bin/sdk on every build, so the SDK cannot be held out by hand.
sdk/tcc and sdk/lua stay (installed by their own targets), as does 0:/tmp,
which the libc uses for tmpnam() and not just compiler intermediates.

Also strip .release-tmp/boot/kernel. The ramdisk carries its own copy of
the kernel -- the image the Installer lays down on the target disk -- and
it is not named *.elf, so the existing find missed it. It was shipping
unstripped at 6.2 MB against 0.7 MB.

Licensing: NetSurf (GPLv2, MIT artwork), the ten NetSurf project libraries
(MIT), utf8proc (MIT) and zlib now ship in both images and had no
attribution anywhere. Add notices for each, and broaden the stb_image
section to cover stb_truetype, which the GUI apps have always linked. The
component lists in license.txt and license.html were stale to match;
license.txt is the source for 0:/os/licenses/LICENSE.txt, so it ships.

downloads.html: 0.1.9 card with separate download links for the plain and
SDK images; 0.1.8 moves to the archive.

Co-Authored-By: Claude Opus 5 <[email protected]>

kernel/src/Api/Info.hpp

@@ -17,7 +17,7 @@ namespace montauk::abi {
 
         // Copy strings into fixed-size arrays (user-accessible)
         const char* name = "MontaukOS";
-        const char* ver = "0.1.9";
+        const char* ver = "0.2.0";
         for (int i = 0; name[i]; i++) outInfo->osName[i] = name[i];
         outInfo->osName[9] = '\0';
         for (int i = 0; ver[i]; i++) outInfo->osVersion[i] = ver[i];