jekyll: set liquid error mode to strict

[crazy-max]

While working on another PR I found out there are liquid warnings introduced by https://github.com/docker/docker.github.io/pull/15494 in the logs: https://github.com/docker/docker.github.io/runs/8288660605?check_suite_focus=true#step:4:491

#15 44.17     Liquid Warning: Liquid syntax error (line 59): Expected end_of_string but found id in "{{if eq .Name "compose"}}" in compose/install/uninstall.md
#15 44.17     Liquid Warning: Liquid syntax error (line 59): [:dot, "."] is not a valid expression in "{{.Path}}" in compose/install/uninstall.md

Looking at this page https://docs.docker.com/compose/install/uninstall/#inspect-the-location-of-the-compose-cli-plugin, format is indeed broken:

To avoid this kind of issues in the future, sets Liquid error mode to strict.

Also got the following issue while enabling new error mode for Liquid:

#16 17.79   Liquid Exception: Liquid syntax error (/src/_includes/cli.md line 136): Unexpected character \ in "{{'[],map[],false,0,0s,default,\'\',""' | split: ',' }}" in engine/reference/commandline/app.md
#16 17.79                     ------------------------------------------------
#16 17.79       Jekyll 4.2.2   Please append `--trace` to the `build` command
#16 17.79                      for any additional information or backtrace.
#16 17.79                     ------------------------------------------------

This is fixed with last commit by using capture instead of assign.

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