restore initial project even if serve crashes (#262)

[tlienart]

closes #262

[codecov-commenter]

Codecov Report

Patch coverage: 92.23% and project coverage change: -0.07% :warning:

Comparison is base (e8ffc37) 84.74% compared to head (a04512f) 84.67%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #269 +/- ## ========================================== - Coverage 84.74% 84.67% -0.07% ========================================== Files 67 67 Lines 3723 3726 +3 ========================================== Hits 3155 3155 - Misses 568 571 +3 ``` | [Files Changed](https://app.codecov.io/gh/tlienart/Xranklin.jl/pull/269?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Thibaut+Lienart) | Coverage Δ | | |---|---|---| | [src/logging/timer.jl](https://app.codecov.io/gh/tlienart/Xranklin.jl/pull/269?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Thibaut+Lienart#diff-c3JjL2xvZ2dpbmcvdGltZXIuamw=) | `8.47% <33.33%> (-1.88%)` | :arrow_down: | | [src/build/serve.jl](https://app.codecov.io/gh/tlienart/Xranklin.jl/pull/269?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Thibaut+Lienart#diff-c3JjL2J1aWxkL3NlcnZlLmps) | `94.96% <94.00%> (-0.66%)` | :arrow_down: |

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[github-actions[bot]]

Preview should be up in a couple of mins at https://tlienart.github.io/Xranklin.jl/previews/PR269 (if you get a 404, wait 30s then refresh).