✨ add --completions <shell> arg to generate completions

[ttytm]

Allows to generate shell completions to simplify usage:

E.g. while typing:

wthrr -

wthrr -f

• update docs

[github-actions]

Filename                              Stmts    Miss  Cover    Missing
----------------------------------  -------  ------  -------  ------------------------------------------------------------------------------------------------------------
src/main.rs                              16      16  0.00%    19-39
src/modules/api.rs                       24      13  45.83%   26-29, 38, 49-88
src/modules/args.rs                       4       4  0.00%    97-101
src/modules/config.rs                    29      23  20.69%   51-92
src/modules/forecast.rs                  18       4  77.78%   20-21, 23-24
src/modules/localization.rs             106      43  59.43%   162-206, 216, 233-269
src/modules/location.rs                  53      27  49.06%   25-29, 59-63, 75, 95-104, 109, 118-126, 131-132, 142-143
src/modules/params.rs                    52      52  0.00%    25-139
src/modules/units.rs                     13       0  100.00%
src/modules/weather.rs                   28      28  0.00%    83-154
src/modules/display/border.rs            47      18  61.70%   20-22, 26-27, 31-33, 37-38, 42-44, 48-50, 105-106
src/modules/display/current.rs           46       6  86.96%   34, 38, 84, 97, 126-127
src/modules/display/day.rs               42       7  83.33%   29, 33, 58, 61, 67, 92-93
src/modules/display/graph.rs            169      61  63.91%   87-126, 142, 149, 156, 161, 177, 183-187, 197, 211, 218, 225, 230, 246, 275-284, 295-317, 334, 343, 365, 370
src/modules/display/gui_config.rs        15       3  80.00%   48, 54, 60
src/modules/display/historical.rs        44      44  0.00%    23-153
src/modules/display/hourly.rs           163      97  40.49%   48-67, 71-80, 89-92, 99, 141, 145-146, 229, 250, 269-279, 323-457
src/modules/display/product.rs           26      26  0.00%    26-76
src/modules/display/utils.rs             35       6  82.86%   14-17, 23, 54-55
src/modules/display/weathercode.rs       31      23  25.81%   13, 17-23, 26-32, 34-41
src/modules/display/week.rs              45       3  93.33%   36, 105-106
src/modules/display/wind.rs              21      11  47.62%   24-27, 35-38, 40-42
TOTAL                                  1027     515  49.85%

[github-actions]

Test Results

13 tests  ±0   13 ✅ ±0   1s ⏱️ ±0s
 1 suites ±0    0 💤 ±0 
 1 files   ±0    0 ❌ ±0 

Results for commit 76378bf. ± Comparison against base commit f9ce06e.