Update QR_eps.ipynb: Replace HTML entities with Unicode characters and simplify language_info

- Replace HTML entity ε with Unicode character ε in title and text
- Replace HTML entities ▸ and ▾ with Unicode characters in sklearn CSS
- Simplify language_info metadata by removing version-specific details

Author: statmlben

doc/source/examples/QR_eps.ipynb

@@ -6,11 +6,11 @@
         "id": "9MRrI75l7SFc"
       },
       "source": [
-        "# Quantile Regression with ε-tolerance\n",
+        "# Quantile Regression with \u03b5-tolerance\n",
         "\n",
-        "[![Slides](https://img.shields.io/badge/🦌-ReHLine-blueviolet)](https://rehline-python.readthedocs.io/en/latest/)\n",
+        "[![Slides](https://img.shields.io/badge/\ud83e\udd8c-ReHLine-blueviolet)](https://rehline-python.readthedocs.io/en/latest/)\n",
         "\n",
-        "Quantile Regression with ε-tolerance solves the following optimization problem:\n",
+        "Quantile Regression with \u03b5-tolerance solves the following optimization problem:\n",
         "$$\n",
         "\\min_{\\mathbf{\\beta} \\in \\mathbb{R}^d} \\sum_{i=1}^{n} (\\rho_\\kappa(y_i - \\mathbf{x}_i^\\intercal \\mathbf{\\beta}) - \\epsilon)_+ + \\frac{\\lambda}{2} \\|\\mathbf{\\beta}\\|^2\n",
         "$$\n",
@@ -219,7 +219,7 @@
               "\n",
               "#sk-container-id-1 label.sk-toggleable__label-arrow:before {\n",
               "  /* Arrow on the left of the label */\n",
-              "  content: \"▸\";\n",
+              "  content: \"\u25b8\";\n",
               "  float: left;\n",
               "  margin-right: 0.25em;\n",
               "  color: var(--sklearn-color-icon);\n",
@@ -264,7 +264,7 @@
               "}\n",
               "\n",
               "#sk-container-id-1 input.sk-toggleable__control:checked~label.sk-toggleable__label-arrow:before {\n",
-              "  content: \"▾\";\n",
+              "  content: \"\u25be\";\n",
               "}\n",
               "\n",
               "/* Pipeline/ColumnTransformer-specific style */\n",
@@ -933,7 +933,7 @@
               "\n",
               "#sk-container-id-2 label.sk-toggleable__label-arrow:before {\n",
               "  /* Arrow on the left of the label */\n",
-              "  content: \"▸\";\n",
+              "  content: \"\u25b8\";\n",
               "  float: left;\n",
               "  margin-right: 0.25em;\n",
               "  color: var(--sklearn-color-icon);\n",
@@ -978,7 +978,7 @@
               "}\n",
               "\n",
               "#sk-container-id-2 input.sk-toggleable__control:checked~label.sk-toggleable__label-arrow:before {\n",
-              "  content: \"▾\";\n",
+              "  content: \"\u25be\";\n",
               "}\n",
               "\n",
               "/* Pipeline/ColumnTransformer-specific style */\n",
@@ -1477,18 +1477,9 @@
       "name": "python3"
     },
     "language_info": {
-      "codemirror_mode": {
-        "name": "ipython",
-        "version": 3
-      },
-      "file_extension": ".py",
-      "mimetype": "text/x-python",
-      "name": "python",
-      "nbconvert_exporter": "python",
-      "pygments_lexer": "ipython3",
-      "version": "3.12.0"
+      "name": "python"
     }
   },
   "nbformat": 4,
   "nbformat_minor": 0
-}
+}