feat: show last mod information in search results

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 origin page as parameter

There are several use cases in which knowing the page where a search
request originated would be useful. This commit adds a `from` parameter
which provides

feat(search): add origin page as parameter

There are several use cases in which knowing the page where a search
request originated would be useful. This commit adds a `from` parameter
which provides that information.

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feat(search): add link to restrict search to result namespace

feat(search): trigger event for search form modification

Plugins may want to offer more ways to filter the search results.

feat(search): trigger event for each result

Add events around each search result, both for the pagename results
and the fullpage results.

The fullpage results are wrapped in a div for better separa

feat(search): trigger event for each result

Add events around each search result, both for the pagename results
and the fullpage results.

The fullpage results are wrapped in a div for better separation and
styling.
( see https://developer.mozilla.org/en-US/docs/Web/HTML/Element/dl )

These events are intended to provide plugin authors with the ability
to hydrate the search results with more information.

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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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feat(Search): Add search form on results page

Add the search form on the results page itself. This form will be used
to add more options to refine the search further.

refactor(Search): refactor html_search into Ui/Search

This commit should be without functional changes.