Convert docdock theme from submodule to native files and fix Hugo compatibility

themes/docdock/exampleSite/content/content-organisation/customize-style/theme-variants.md

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++++
+title = "Theme variants"
+description = "change theme style/colors"
++++
+
+In site configuration file, you can set a variant name of this theme to load a specific css, with different color specifications.
+
+add a param `themeVariant = "VARIANT_NAME"` in the `[params]` part of config.toml file.
+
+{{%info%}}Available variants change only colors at this moment{{%/info%}}
+
+
+## Variant "gray"
+```
+[params]
+themeVariant = "gray"
+```
+
+![green docdock](/variant-gray.png)
+
+## Variant "gold"
+```
+[params]
+themeVariant = "gold"
+```
+
+![gold docdock](/variant-gold.png)
+
+## Variant "green"
+```
+[params]
+themeVariant = "green"`
+```
+
+![green docdock](/variant-green.png)