Add a link to the nursery; tweak icons

[charliermarsh]

Summary

We now always render the icons, but very faintly if inactive, and always right-align. This ensures consistent alignment as you scroll down the page:

[github-actions]

PR Check Results

Ecosystem

✅ ecosystem check detected no changes.

Benchmark

Linux

group                                      main                                   pr
-----                                      ----                                   --
formatter/large/dataset.py                 1.13      9.4±0.02ms     4.3 MB/sec    1.00      8.3±0.01ms     4.9 MB/sec
formatter/numpy/ctypeslib.py               1.10   1948.6±2.54µs     8.5 MB/sec    1.00   1769.7±3.52µs     9.4 MB/sec
formatter/numpy/globals.py                 1.06    207.3±0.39µs    14.2 MB/sec    1.00    194.9±0.21µs    15.1 MB/sec
formatter/pydantic/types.py                1.12      4.4±0.01ms     5.7 MB/sec    1.00      4.0±0.02ms     6.4 MB/sec
linter/all-rules/large/dataset.py          1.00     13.8±0.03ms     2.9 MB/sec    1.01     13.9±0.03ms     2.9 MB/sec
linter/all-rules/numpy/ctypeslib.py        1.00      3.5±0.01ms     4.8 MB/sec    1.00      3.5±0.01ms     4.7 MB/sec
linter/all-rules/numpy/globals.py          1.00    361.0±1.31µs     8.2 MB/sec    1.00    362.2±1.55µs     8.1 MB/sec
linter/all-rules/pydantic/types.py         1.00      6.1±0.01ms     4.2 MB/sec    1.01      6.2±0.01ms     4.1 MB/sec
linter/default-rules/large/dataset.py      1.00      7.1±0.01ms     5.8 MB/sec    1.01      7.2±0.01ms     5.7 MB/sec
linter/default-rules/numpy/ctypeslib.py    1.00   1458.8±3.98µs    11.4 MB/sec    1.01   1468.4±2.87µs    11.3 MB/sec
linter/default-rules/numpy/globals.py      1.00    155.5±0.30µs    19.0 MB/sec    1.01    156.5±0.28µs    18.9 MB/sec
linter/default-rules/pydantic/types.py     1.00      3.2±0.01ms     8.1 MB/sec    1.01      3.2±0.01ms     8.0 MB/sec

Windows

group                                      main                                   pr
-----                                      ----                                   --
formatter/large/dataset.py                 1.00     12.5±0.49ms     3.2 MB/sec    1.02     12.8±0.55ms     3.2 MB/sec
formatter/numpy/ctypeslib.py               1.00      2.6±0.11ms     6.3 MB/sec    1.03      2.7±0.12ms     6.1 MB/sec
formatter/numpy/globals.py                 1.00   303.0±17.75µs     9.7 MB/sec    1.04   315.2±29.03µs     9.4 MB/sec
formatter/pydantic/types.py                1.00      5.9±0.19ms     4.3 MB/sec    1.02      6.0±0.21ms     4.3 MB/sec
linter/all-rules/large/dataset.py          1.00     20.3±0.61ms     2.0 MB/sec    1.04     21.2±0.86ms  1965.0 KB/sec
linter/all-rules/numpy/ctypeslib.py        1.00      5.4±0.21ms     3.1 MB/sec    1.01      5.4±0.21ms     3.1 MB/sec
linter/all-rules/numpy/globals.py          1.00   641.8±27.22µs     4.6 MB/sec    1.03   662.7±24.90µs     4.5 MB/sec
linter/all-rules/pydantic/types.py         1.00      9.2±0.37ms     2.8 MB/sec    1.03      9.4±0.36ms     2.7 MB/sec
linter/default-rules/large/dataset.py      1.00     10.5±0.32ms     3.9 MB/sec    1.03     10.8±0.37ms     3.8 MB/sec
linter/default-rules/numpy/ctypeslib.py    1.00      2.2±0.10ms     7.5 MB/sec    1.01      2.2±0.09ms     7.4 MB/sec
linter/default-rules/numpy/globals.py      1.00   266.2±19.10µs    11.1 MB/sec    1.03   275.0±11.38µs    10.7 MB/sec
linter/default-rules/pydantic/types.py     1.00      4.7±0.19ms     5.5 MB/sec    1.04      4.9±0.16ms     5.3 MB/sec