feat: hold tasks on deck and goals on the wishlist in mission control

[sbillinge]

The holding sections both held goals, so a task pasted down under On-deck was read as a goal and its id ended up in two collections. The sections are now "On-deck tasks" and "Wishlist goals", each read as the week and goals sections are. A line is pasted down as it is: the id keeps it the same record, the number is not read, since the numbers of a period move, and a line typed there is of no goal or project, and of whoever's document it is, until it is moved up and numbered. A line whose id is in two places is refused, so a thing is moved by cutting it. The old headings are still read, into the wishlist.

mc.py reads the sections and settles what a held line keeps; the builder writes tasks on deck under their own heading, out of the weeks; the sync finds a task of no goal by whose it is; mc_tasks gains a lead for such a task; the docs page describes the sections.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.56%. Comparing base (a10302b) to head (7650408).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1394      +/-   ##
==========================================
+ Coverage   91.34%   91.56%   +0.21%     
==========================================
  Files          29       29              
  Lines        3351     3438      +87     
==========================================
+ Hits         3061     3148      +87     
  Misses        290      290              

Files with missing lines	Coverage Δ
tests/test_mc.py	100.00% <ø> (ø)
tests/test_mc_changes.py	100.00% <100.00%> (ø)
tests/test_mc_parser.py	100.00% <100.00%> (ø)
tests/test_mcsynchelper.py	100.00% <100.00%> (ø)
tests/test_missioncontrolbuilder.py	100.00% <100.00%> (ø)

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