Update Gem Files

Remove specific versions from Gemfile. A specific version
can be specified in Gemfile.lock if really necessary.

Fix parse errors in .bundle/config by moving the license to
.reuse/dep5. Can't remove the copyright statement because
the CI license check will fail, this makes `reuse` happy.

Bundle config files are a subset of YAML. Bundle uses its own
parser that doesn't support this syntax. Bundle only supports
config files generated with `bundle config`.

Signed-off-by: Indan Zupancic <indan@nul.nu>

.bundle/config

@@ -1,8 +1,3 @@
-# Copyright 2021 seL4 Foundation
-#
-# SPDX-License-Identifier: BSD-2-Clause
-
 ---
-
 BUNDLE_PATH: "vendor/bundle"
 BUNDLE_DISABLE_SHARED_GEMS: "true"

.reuse/dep5

@@ -10,6 +10,7 @@ Source: https://docs.sel4.systems
 # License: ...
 
 Files: Gemfile.lock
+       .bundle/config
        Hardware/HiKey/*.patch
        Hardware/CEI_TK1_SOM/CANBoard/Tegra_CANboard_tofab_v1.zip
 Copyright: 2020 seL4 Project a Series of LF Projects, LLC.

Gemfile

@@ -11,7 +11,7 @@ source "https://rubygems.org"
 #
 # This will help ensure the proper Jekyll version is running.
 # Happy Jekylling!
-gem "jekyll", "~> 4.0.0"
+gem "jekyll"
 
 # If you want to use GitHub Pages, remove the "gem "jekyll"" above and
 # uncomment the line below. To upgrade, run `bundle update github-pages`.
@@ -20,11 +20,11 @@ gem "jekyll", "~> 4.0.0"
 # If you have any plugins, put them here!
 # Look here for supported github plugins: https://pages.github.com/versions/
 group :jekyll_plugins do
-  gem "jekyll-titles-from-headings", "0.5.3"
-  gem "jekyll-relative-links", "0.6.1"
-  gem "jekyll-optional-front-matter", "0.3.2"
-  gem "jekyll-sitemap", "1.4.0"
-  gem 'jekyll-toc', "0.5.2"
+  gem "jekyll-titles-from-headings"
+  gem "jekyll-relative-links"
+  gem "jekyll-optional-front-matter"
+  gem "jekyll-sitemap"
+  gem 'jekyll-toc'
   gem 'jekyll-redirect-from'
   gem 'jekyll-remote-theme'
 end