docs(bpp): separate behavior path planner documents

[satoshi-ota]

Description

Move documentation and images to separated packages.

Tests performed

CI/CD

Effects on system behavior

Nothing.

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[github-actions]

Documentation URL: https://autowarefoundation.github.io/autoware.universe/pr-5961/
Modified URLs:

• https://autowarefoundation.github.io/autoware.universe/pr-5961/planning/behavior_path_avoidance_by_lane_change_module/
• https://autowarefoundation.github.io/autoware.universe/pr-5961/planning/behavior_path_avoidance_module/
• https://autowarefoundation.github.io/autoware.universe/pr-5961/planning/behavior_path_goal_planner_module/
• https://autowarefoundation.github.io/autoware.universe/pr-5961/planning/behavior_path_lane_change_module/
• https://autowarefoundation.github.io/autoware.universe/pr-5961/planning/behavior_path_planner/
• https://autowarefoundation.github.io/autoware.universe/pr-5961/planning/behavior_path_planner_common/behavior_path_planner_drivable_area_design/
• https://autowarefoundation.github.io/autoware.universe/pr-5961/planning/behavior_path_planner_common/behavior_path_planner_path_generation_design/
• https://autowarefoundation.github.io/autoware.universe/pr-5961/planning/behavior_path_planner_common/behavior_path_planner_safety_check/
• https://autowarefoundation.github.io/autoware.universe/pr-5961/planning/behavior_path_planner_common/behavior_path_planner_turn_signal_design/
• https://autowarefoundation.github.io/autoware.universe/pr-5961/planning/behavior_path_side_shift_module/
• https://autowarefoundation.github.io/autoware.universe/pr-5961/planning/behavior_path_start_planner_module/

[zulfaqar-azmi-t4]

LGTM.
Thank you soo much for the update.

[kyoichi-sugahara]

LGTM!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2edd55e) 15.29% compared to head (3b3feb1) 15.31%.
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5961      +/-   ##
==========================================
+ Coverage   15.29%   15.31%   +0.02%     
==========================================
  Files        1750     1750              
  Lines      120566   120691     +125     
  Branches    36783    36876      +93     
==========================================
+ Hits        18435    18479      +44     
  Misses      81465    81465              
- Partials    20666    20747      +81     

Flag	Coverage Δ		*Carryforward flag
differential	11.81% <ø> (?)
total	15.29% <ø> (ø)		Carriedforward from 2edd55e

*This pull request uses carry forward flags. Click here to find out more.

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[xiaoqingdong]

when crossing the center line of the lane , the car can not avoid obstacle, this is our obstacle avoidance strategy? if we want to avoid obstacle only need consider enough space, what can we do?