add basic hugo template

ansibledoctor/templates/hugo/_meta.j2

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+{% set meta = role.meta | default({}) %}
+{% if meta %}
+## Dependencies
+
+{% if meta | deep_get(meta, "dependencies.value") %}
+{% for item in meta.dependencies.value %}
+* {{ item }}
+{% endfor %}
+{% else %}
+None.
+{% endif %}
+{% endif %}

ansibledoctor/templates/hugo/_toc.j2

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+## Table of content
+
+{% set var = role.var | default({}) %}
+{% if var %}
+* [Default Variables](#default-variables)
+{% for key, item in var | dictsort %}
+  * [{{ key }}](#{{ key }})
+{% endfor %}
+{% endif %}
+* [Dependencies](#dependencies)
+* [License](#license)
+* [Author](#author)
+
+---

ansibledoctor/templates/hugo/_vars.j2

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+{% set var = role.var | default({}) %}
+{% if var %}
+
+## Default Variables
+{% for key, item in var | dictsort %}
+
+### {{ key }}
+{% if item.description is defined and item.description %}
+
+{{ item.description | save_join(" ") | striptags }}
+{% endif %}
+{% if item.value is defined and item.value %}
+
+#### Default value
+
+```YAML
+{% if item.value is mapping %}
+{{ item.value | to_nice_yaml(indent=2) }}
+{% else %}
+{% for ve_line in item.value %}
+{{ ve_line }}
+{% endfor %}
+{% endif %}
+```
+{% endif %}
+{% if item.example is defined and item.example %}
+
+#### Example usage
+
+```YAML
+{% if item.example is mapping %}
+{{ item.example | to_nice_yaml(indent=2) }}
+{% else %}
+{% for ex_line in item.example %}
+{{ ex_line }}
+{% endfor %}
+{% endif %}
+```
+{% endif %}
+{% endfor %}
+{% endif %}

ansibledoctor/templates/hugo/index.md.j2

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+{% set meta = role.meta | default({}) %}
+---
+title: {{ meta.name.value | save_join(" ") }} 
+---
+
+{% if description | deep_get(meta, "description.value") %}
+{{ meta.description.value | save_join(" ") }}
+{% endif %}
+
+{#      TOC      #}
+{% include '_toc.j2'  %}
+
+{#      Vars      #}
+{% include '_vars.j2'  %}
+
+{#      Meta      #}
+{% include '_meta.j2'  %}