LMS: removing now unnecessary IE-specific _ie.scss Sass partial

* since IE9 and below are formally not supported any longer
* since most of the CSS rules are for UI that has been removed or that is supported by modern browsers

lms/envs/common.py

@@ -1272,14 +1272,12 @@ PIPELINE_CSS = {
     'style-main': {
         'source_filenames': [
             'sass/lms-main.css',
-            'sass/ie.css'
         ],
         'output_filename': 'css/lms-main.css',
     },
     'style-main-rtl': {
         'source_filenames': [
             'sass/lms-main-rtl.css',
-            'sass/ie-rtl.css'
         ],
         'output_filename': 'css/lms-main-rtl.css',
     },

lms/static/sass/ie.scss

-@import "bourbon/bourbon";
-@import "base/variables";
-
-// These are all quick solutions for IE please rewrite
-.ie {
-
-  //Make overlay white because ie doesn't like rgba
-  .highlighted-courses .courses .course header.course-preview, .find-courses .courses .course header.course-preview,
-  .home .highlighted-courses > h2, .home .highlighted-courses > section.outside-app h1, section.outside-app .home .highlighted-courses > h1,
-  header.global {
-    background: $white;
-  }
-
-  // hide all actions
-  .home > header .title .actions,
-  .home > header .title:hover .actions,
-  .home > header .title:focus .actions {
-    display: none;
-    height: auto;
-  }
-
-  .home > header .title {
-    &:hover, &:focus {
-
-      > hgroup {
-        h1 {
-          border-bottom: 0;
-          padding-bottom: 0;
-        }
-
-        h2 {
-          opacity: 1.0;
-        }
-      }
-
-      .actions {
-        opacity: 0;
-      }
-    }
-  }
-
-  // because ie doesn't like :last
-  .last {
-    margin-right: 0  !important;
-  }
-
-  // make partners not animate
-  .home .university-partners .partners a {
-    .name {
-      position: static;
-    }
-
-    &:hover, &:focus {
-      text-decoration: none;
-
-      &::before {
-        opacity: 1.0;
-      }
-
-      .name {
-        bottom: 0px;
-      }
-
-      img {
-        top: 0px;
-      }
-    }
-
-  }
-
-  .home .university-partners .partners {
-    width: 660px;
-
-    li.partner {
-      float: left;
-      display: block;
-      padding: 0;
-      width: 220px;
-      overflow: hidden;
-    }
-  }
-
-  // make animations on homepage not animate and show everything
-  .highlighted-courses .courses .course, .find-courses .courses .course {
-    .meta-info {
-      display: none;
-    }
-
-    .inner-wrapper {
-      height: 100%;
-      overflow: visible;
-      position: relative;
-    }
-
-    header.course-preview {
-      left: 0px;
-      position: relative;
-      top: 0px;
-      width: 100%;
-      z-index: 3;
-      height: auto;
-
-      hgroup {
-        position: relative;
-        right: 0;
-        top: 0;
-      }
-
-    }
-
-    .info {
-      height: auto;
-      position: static;
-      overflow: visible;
-
-      .desc {
-        height: auto;
-      }
-    }
-
-    &:hover, &:focus {
-      background: rgb(245,245,245);
-      border-color: rgb(170,170,170);
-      box-shadow: 0 1px 16px 0 rgba($blue, 0.4);
-
-      .info {
-        top: 0;
-      }
-
-      .meta-info {
-        opacity: 0;
-      }
-    }
-  }
-
-  // make overlay flat black since IE cant handle rgba
-  #lean_overlay {
-    background: $black;
-  }
-
-  // active navigation
-  nav.wrapper-course-material ol.course-tabs li a.active, nav.wrapper-course-material .xmodule_SequenceModule nav.sequence-nav ol.course-tabs li a.seq_video.active, .xmodule_SequenceModule nav.sequence-nav nav.wrapper-course-material ol.course-tabs li a.seq_video.active {
-    background-color: #333;
-    background-color: rgba(0, 0, 0, .4);
-  }
-
-  // make dropdown user consistent size
-  header.global ol.user > li.primary a.dropdown {
-    padding-top: 6px;
-    padding-bottom: 6px;
-  }
-
-  // always hide arrow in IE
-  .dashboard .my-courses .my-course .cover .arrow {
-    display: none;
-  }
-
-  div.course-wrapper {
-    display: block !important;
-
-    section.course-content,
-    div.course-index {
-      display: block !important;
-      float: left;
-    }
-
-    section.course-content {
-      width: 71.27%;
-    }
-  }
-
-  .sidebar {
-    float: left !important;
-    display: block !important;
-  }
-
-  .sequence-nav ol {
-    display: block !important;
-
-    li {
-      float: left !important;
-      width: 50px;
-    }
-  }
-
-  .course-wrapper {
-    @include clearfix();
-  }
-}
-
-// ====================
-
-// CASE: IE9
-.lte9 {
-
-  .ie-banner {
-    display: block !important;
-  }
-}