Migrated docs to Asciidoc, Antora and MrDocs

[anarthal]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.95%. Comparing base (4bfdd8f) to head (93e416f). Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #388   +/-   ##
========================================
  Coverage    98.95%   98.95%           
========================================
  Files          142      142           
  Lines         7199     7199           
========================================
  Hits          7124     7124           
  Misses          75       75           

Files with missing lines	Coverage Δ
include/boost/mysql/any_address.hpp	100.00% <ø> (ø)
include/boost/mysql/any_connection.hpp	100.00% <100.00%> (ø)
include/boost/mysql/client_errc.hpp	100.00% <ø> (ø)
include/boost/mysql/common_server_errc.hpp	100.00% <ø> (ø)
include/boost/mysql/connection.hpp	97.82% <ø> (ø)
include/boost/mysql/connection_pool.hpp	100.00% <ø> (ø)
include/boost/mysql/constant_string_view.hpp	100.00% <ø> (ø)
include/boost/mysql/date.hpp	100.00% <ø> (ø)
include/boost/mysql/datetime.hpp	100.00% <ø> (ø)
...detail/execution_processor/static_results_impl.hpp	100.00% <100.00%> (ø)
... and 26 more

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