Update JS dependencies and misc tweaks (go-gitea#25540)

- Update all JS dependencies
- Enable `declaration-property-unit-disallowed-list` to forbid `em` on
`line-height`
- Rename dependency update targets to `update-js` and `update-py` and
document them
- Remove margin on Asciicast viewer
- Tested Swagger, Katex, Asciicast

<img width="1243" alt="Screenshot 2023-06-27 at 19 51 05"
src="https://github.com/go-gitea/gitea/assets/115237/2d2722a0-2aa7-4f4c-b8bd-17e1f3637b78">

.stylelintrc.yaml

@@ -50,7 +50,7 @@ rules:
   declaration-no-important: null
   declaration-property-max-values: null
   declaration-property-unit-allowed-list: null
-  declaration-property-unit-disallowed-list: null
+  declaration-property-unit-disallowed-list: {line-height: [em]}
   declaration-property-value-allowed-list: null
   declaration-property-value-disallowed-list: null
   declaration-property-value-no-unknown: true

Makefile

@@ -226,6 +226,8 @@ help:
 	@echo " - test-frontend                    test frontend files"
 	@echo " - test-backend                     test backend files"
 	@echo " - test-e2e[\#TestSpecificName]     test end to end using playwright"
+	@echo " - update-js                        update js dependencies"
+	@echo " - update-py                        update py dependencies"
 	@echo " - webpack                          build webpack files"
 	@echo " - svg                              build svg files"
 	@echo " - fomantic                         build fomantic files"
@@ -924,15 +926,15 @@ node_modules: package-lock.json
 	poetry install
 	@touch .venv
 
-.PHONY: npm-update
-npm-update: node-check | node_modules
+.PHONY: update-js
+update-js: node-check | node_modules
 	npx updates -u -f package.json
 	rm -rf node_modules package-lock.json
 	npm install --package-lock
 	@touch node_modules
 
-.PHONY: poetry-update
-poetry-update: node-check | node_modules
+.PHONY: update-py
+update-py: node-check | node_modules
 	npx updates -u -f pyproject.toml
 	rm -rf .venv poetry.lock
 	poetry install