Remove allocations in Markup by switching to Cow<'static, str>
#1250
| Job | Run time |
|---|---|
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| 10s | |
| 5m 38s | |
| 6s | |
| 1m 53s | |
| 3m 34s | |
| 3m 34s | |
| 3m 34s | |
| 7m 1s | |
| 3m 46s | |
| 4m 32s | |
| 5m 33s | |
| 6m 48s | |
| 3m 27s | |
| 3m 42s | |
| 55m 21s |