feat(search): display search tools as lists on click

This functionality is inspired by what other large search engines are
doing.

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feat(search): remember assistance's open/closed state

feat(search): show search adjustments as links

This simplifies many aspects. However, it still needs much better
styling.

feat(search): add config options to adjust default behavior

This adds two new config options:

`search_limit_to_first_ns`:
Limit the search to the current X namespaces. When a search is executed
fro

feat(search): add config options to adjust default behavior

This adds two new config options:

`search_limit_to_first_ns`:
Limit the search to the current X namespaces. When a search is executed
from a page within a deeper namespace, the first X namespaces will be
added as filter.
Possible use case could be with language namespaces to ensure that the
default search is initially within the current language.

`search_default_fragment_behaviour`:
Option to specify the default fragment search behavior

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feat(search): add search assistance for simple queries

This add some search assistance to simple, single-word search queries
which may be restricted to a single namespace.

Further improvements:
* b

feat(search): add search assistance for simple queries

This add some search assistance to simple, single-word search queries
which may be restricted to a single namespace.

Further improvements:
* better styling
* trigger events for other plugins
* set namespaces directly from fulltext search results
* some more config options

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fix: use exit instead of return in the global scope

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fix(manifest): check if manifest action enabled before sending

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refactor: move manifest functions to more intuitive places

feat: ensure that the cope is always only the current wiki

feat: use style replacements for background and theme color

This also adds the default theme color for the DokuWiki template as the
green from the existing links.

refactor: extract css utils to an autoloaded class

The goal is to make the css replacement accessible in other contexts,
for example for the manifest.

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feat: provide web app manifest (dynamically geneated)

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