feat: set default expiration in select (#28)

No default value in select could be interpreted as ever lasting note.
Default value in the select makes that clearer.

Co-authored-by: Thibault Piron <thibault.a.piron@gmail.com>
Reviewed-on: #28
Reviewed-by: Julien Riou <jriou@monitoring@riou.xyz>
Co-authored-by: tapiron <tapiron@monitoring@riou.xyz>
Co-committed-by: tapiron <tapiron@monitoring@riou.xyz>

src/server/templates/index.html

@@ -36,9 +36,9 @@
                 </div>
                 <div class="col">
                     <select class="form-select" aria-label="Expiration" id="expiration" name="expiration">
-                        <option selected="selected" disabled>Expiration</option>
-                        {{range .Expirations}}
-                        <option value="{{.}}">{{HumanDuration .}}</option>
+                        <option disabled>Expiration</option>
+                        {{range $exp := .Expirations}}
+                        <option {{ if eq $exp $.Expiration }}selected="selected"{{end}} value="{{$exp}}">{{HumanDuration $exp}}</option>
                         {{end}}
                     </select>
                 </div>