add a kasm blurb that can be used on all KasmVNC based images

[thelamer]

This can be setup to add information after the app setup block using the following variables:

# kasm variables
kasm_blurb: true
external_http_port: "3000"
external_https_port: "3001"
noto_fonts: "font-noto-cjk"
show_nvidia: true

If only the kasm_blurb: true is set all defaults will be set as laid out here minus the nvidia support that needs to be specifically enabled for images that support it as Alpine does not. The Alpine blurb in the Nvidia section is to cover us for webtop or other images that may be multi distro base in the future.

The ports are needed for images that are off the default 3000 and 3001, the maintainer will need to know what font noto package to use for their image base flavor here are the current packages:

Arch: noto-fonts-cjk
Debian/Ubuntu: fonts-noto-cjk
Alpine: font-noto-cjk
Fedora: google-noto-cjk-fonts

IE for webtop the inline readme-vars.yml will look like this:

# application setup block
app_setup_block_enabled: true
app_setup_block: |
  The Webtop can be accessed at:

  * http://yourhost:3000/
  * https://yourhost:3001/

# kasm variables
kasm_blurb: true
external_http_port: "3000"
external_https_port: "3001"
noto_fonts: "font-noto-cjk"
show_nvidia: true

[LinuxServer-CI]

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https://ci-tests.linuxserver.io/lspipepr/jenkins-builder/077de28a-pkg-077de28a-dev-274fadc74589bf38faeff104093537b0c1e57088-pr-290/shellcheck-result.xml

Tag	Passed
amd64-077de28a-pkg-077de28a-dev-274fadc74589bf38faeff104093537b0c1e57088-pr-290	✅
arm64v8-077de28a-pkg-077de28a-dev-274fadc74589bf38faeff104093537b0c1e57088-pr-290	✅

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https://ci-tests.linuxserver.io/lspipepr/jenkins-builder/077de28a-pkg-077de28a-dev-e2e748ac880fb15d6dc3d53f3185092544183d46-pr-290/shellcheck-result.xml

Tag	Passed
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arm64v8-077de28a-pkg-077de28a-dev-e2e748ac880fb15d6dc3d53f3185092544183d46-pr-290	✅

[Roxedus]

This should probably also be on the docs page, by having the same blurb in the docs template.

[LinuxServer-CI]

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https://ci-tests.linuxserver.io/lspipepr/jenkins-builder/077de28a-pkg-077de28a-dev-2a39d03ad61982e7ec8d12fdde5a62d27f2fb362-pr-290/shellcheck-result.xml

Tag	Passed
amd64-077de28a-pkg-077de28a-dev-2a39d03ad61982e7ec8d12fdde5a62d27f2fb362-pr-290	✅
arm64v8-077de28a-pkg-077de28a-dev-2a39d03ad61982e7ec8d12fdde5a62d27f2fb362-pr-290	✅

[Roxedus]

It still targets only the readme, but should also be mentioned in the documentation.

[LinuxServer-CI]

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https://ci-tests.linuxserver.io/lspipepr/jenkins-builder/077de28a-pkg-077de28a-dev-2a39d03ad61982e7ec8d12fdde5a62d27f2fb362-pr-290/shellcheck-result.xml

Tag	Passed
amd64-077de28a-pkg-077de28a-dev-2a39d03ad61982e7ec8d12fdde5a62d27f2fb362-pr-290	✅
arm64v8-077de28a-pkg-077de28a-dev-2a39d03ad61982e7ec8d12fdde5a62d27f2fb362-pr-290	✅

[thelamer]

It still targets only the readme, but should also be mentioned in the documentation.
a4fe6fc

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https://ci-tests.linuxserver.io/lspipepr/jenkins-builder/077de28a-pkg-077de28a-dev-a4fe6fc97d0757aa45bc1e1be47581101082112d-pr-290/shellcheck-result.xml

Tag	Passed
amd64-077de28a-pkg-077de28a-dev-a4fe6fc97d0757aa45bc1e1be47581101082112d-pr-290	✅
arm64v8-077de28a-pkg-077de28a-dev-a4fe6fc97d0757aa45bc1e1be47581101082112d-pr-290	✅