Refactor styling

[martinRenou]

References

Make a separate style bundle to inject in the page.

If we were to use the style bundle produced by the Voila app we would pull the entire JupyterLab application CSS, breaking custom templates like classic/vuetify/reveal.

This will make #1249 easier by providing a way to inject the CSS needed for JupyterLab mime renderers without breaking template's CSS.

[github-actions]

👈 Launch a Binder on branch martinRenou/voila/refactor_styling

[martinRenou]

The reveal template visual changes are legit, we were not respecting the font sizes specified by nbconvert: https://github.com/jupyter/nbconvert/blob/main/share/templates/reveal/index.html.j2#L80 we now do

Please update galata references

[github-actions]

Benchmark report

The execution time (in milliseconds) are grouped by test file, test type and browser.
For each case, the following values are computed: min <- [1st quartile - median - 3rd quartile] -> max.

Results table

Test file	voila-tree-classic.ipynb	voila-tree-light.ipynb	voila-tree-dark.ipynb	voila-tree-miami.ipynb	basics.ipynb	bqplot.ipynb	dashboard.ipynb	gridspecLayout.ipynb	interactive.ipynb	ipympl.ipynb	multiple_widgets.ipynb	query-strings.ipynb	reveal.ipynb
Render
chromium
actual	145 <- [165 - 202 - 276] -> 476	79 <- [84 - 94 - 110] -> 146	76 <- [82 - 90 - 109] -> 151	75 <- [77 - 86 - 101] -> 127	2973 <- [3126 - 3240 - 3455] -> 5112	3057 <- [3102 - 3159 - 3256] -> 3495	3315 <- [3340 - 3373 - 3435] -> 3702	3424 <- [3442 - 3524 - 3623] -> 3650	2608 <- [2660 - 2683 - 2797] -> 3182	4757 <- [4882 - 5164 - 5591] -> 7075	5424 <- [5438 - 5454 - 5485] -> 5800	2311 <- [2318 - 2375 - 2431] -> 2807	3873 <- [3934 - 4040 - 4288] -> 4936
expected	3379 <- [3442 - 3517 - 3701] -> 3876	2976 <- [3227 - 3321 - 3421] -> 3604	3608 <- [3623 - 3709 - 3793] -> 3825	4453 <- [4453 - 4523 - 4661] -> 4748	2559 <- [2655 - 2656 - 2660] -> 2674	3982 <- [4079 - 4213 - 4356] -> 4743	12183 <- [18509 - 19553 - 20811] -> 21515	15319 <- [15660 - 15796 - 15912] -> 16056	1517 <- [1920 - 1997 - 2103] -> 2113

❗ Test metadata have changed

--- /dev/fd/63	2023-03-16 10:30:38.340276051 +0000
+++ /dev/fd/62	2023-03-16 10:30:38.340276051 +0000
@@ -4,49 +4,49 @@
     "BENCHMARK_REFERENCE": "actual"
   },
   "browsers": {
-    "chromium": "97.0.4666.0"
+    "chromium": "94.0.4595.0"
   },
   "systemInformation": {
     "cpu": {
-      "brand": "Xeon® E5-2673 v4",
+      "brand": "Xeon® E5-2673 v3",
       "cache": {
         "l1d": 65536,
         "l1i": 65536,
         "l2": 524288,
-        "l3": 52428800
+        "l3": 31457280
       },
       "cores": 2,
       "family": "6",
-      "flags": "fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology cpuid pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single pti fsgsbase bmi1 hle avx2 smep bmi2 erms invpcid rtm rdseed adx smap xsaveopt md_clear",
+      "flags": "fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology cpuid pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm invpcid_single pti fsgsbase bmi1 avx2 smep bmi2 erms invpcid xsaveopt md_clear",
       "governor": "",
       "manufacturer": "Intel®",
-      "model": "79",
+      "model": "63",
       "physicalCores": 2,
       "processors": 1,
       "revision": "",
       "socket": "",
-      "speed": 2.3,
+      "speed": 2.4,
       "speedMax": null,
       "speedMin": null,
-      "stepping": "1",
+      "stepping": "2",
       "vendor": "GenuineIntel",
       "virtualization": false,
       "voltage": ""
     },
     "mem": {
-      "total": 7281278976
+      "total": 7291699200
     },
     "osInfo": {
       "arch": "x64",
       "build": "",
-      "codename": "Jammy Jellyfish",
+      "codename": "Focal Fossa",
       "codepage": "UTF-8",
       "distro": "Ubuntu",
-      "kernel": "5.15.0-1034-azure",
+      "kernel": "5.8.0-1040-azure",
       "logofile": "ubuntu",
       "platform": "linux",
-      "release": "22.04.2 LTS",
-      "serial": "2eb8d65c617f413abe6f4d67d8f306ea",
+      "release": "20.04.3 LTS",
+      "serial": "cfc067bfcb844f35865e279a1b0e66c5",
       "servicepack": "",
       "uefi": false
     }

[trungleduc]

Thanks @martinRenou