Add server-wide and user-only federation controls (#133)

### Description

Completes #122

### Please confirm

- [x] I am the legal owner or represent the legal owner of all work submitted (including LLM-generated code, if any)
- [x] I consent to my changes being added to this FOSS project
- [x] I have confirmed that this does not add new errors or warnings with `utils/clippy.sh`
- [ ] This PR used LLMs to generate some or all of the code changes

Reviewed-on: https://git.ngram.ca/OpenJam/rc-servers/pulls/133

assets/templates/rc_society/stylesheet.html.hbs

@@ -36,6 +36,34 @@ body {
 .form-padded {
     padding: 0 25px;
 }
+input:required:invalid.form-input-box {
+    border-color: red;
+}
+input:required:invalid.form-input-box::after {
+    content: "*required";
+    color: red;
+    font-size: 12px;
+}
+input {
+    width: 100%;
+    border: thin solid white;
+    background-color: lightgrey;
+}
+input[type=submit] {
+    cursor: pointer;
+}
+.form-submit {
+    margin: 0 auto;
+}
+.form-submit-button {
+    background-color: black;
+    color: lightgrey;
+}
+.input-required-hint::after {
+    color: red;
+    /*content: "*required";*/
+    font-size: 12px;
+}
 h1, h2, h3, h4, h5 {
     text-align: center;
 }
@@ -55,6 +83,10 @@ form {
     padding-right: 25px;
     padding-bottom: 250px;
 }
+.inline-form {
+    padding: 0;
+    display: contents;
+}
 .form-error {
     position: relative;
     width: 100%;
@@ -112,6 +144,9 @@ form {
     text-align: center;
     width: 100%;
 }
+.access-row-box-input {
+    padding: 5px;
+}
 .access-box-title {
     padding: 5px;
     margin: 0 auto;
@@ -144,6 +179,13 @@ form {
     color: black;
     text-align: left;
 }
+.box-details-input {
+    padding: 0;
+    margin: auto 0;
+}
+.box-details-input-text {
+    padding-right: 6px;
+}
 .export-plugin {
     color: white;
 }