Website page load fixes (mostly) (mne-tools#13343)

Author: drammock

doc/_templates/sidebar-quicklinks.html

@@ -4,7 +4,7 @@ <h5 class="card-header font-weight-bold">Version {{ release }}</h5>
         <ul class="list-group list-group-flush list-unstyled quicklinks">
             <li><a href="{{ pathto('auto_tutorials/index.html', 1) }}"><i class="fas fa-book fa-fw"></i> Tutorials</a></li>
             <li><a href="{{ pathto('development/whats_new.html', 1) }}"><i class="fas fa-newspaper fa-fw"></i> Changelog</a></li>
-            <li><a href="{{ pathto('help/index.html', 1) }}"><i class="fas fa-circle-question fa-fw"></i> Get help</a></li>
+            <li><a href="{{ pathto('help/index.html', 1) }}"><i class="fas fa-circle-question fa-fw"></i> Get Help</a></li>
             <li><a href="{{ pathto('documentation/cite.html', 1) }}"><i class="fas fa-quote-left fa-fw"></i> Cite</a></li>
             <li><a href="{{ pathto('development/contributing.html', 1) }}"><i class="fas fa-code-branch fa-fw"></i> Contribute</a></li>
             <li><a href="{{ pathto('credit.html', 1) }}"><i class="fas fa-hands-clapping fa-fw"></i> Contributors</a></li>

doc/conf.py

@@ -64,7 +64,7 @@
 # (Sphinx looks at variable changes and rewrites all files if some change)
 copyright = (  # noqa: A001
     f'2012–{td.year}, MNE Developers. Last updated <time datetime="{td.isoformat()}" class="localized">{td.strftime("%Y-%m-%d %H:%M %Z")}</time>\n'  # noqa: E501
-    '<script type="text/javascript">$(function () { $("time.localized").each(function () { var el = $(this); el.text(new Date(el.attr("datetime")).toLocaleString([], {dateStyle: "medium", timeStyle: "long"})); }); } )</script>'  # noqa: E501
+    '<script type="text/javascript">function formatTimestamp() {document.querySelectorAll("time.localized").forEach(el => el.textContent = new Date(el.getAttribute("datetime")).toLocaleString([], {dateStyle: "medium", timeStyle: "long"}));};if (document.readyState != "loading") formatTimestamp();else document.addEventListener("DOMContentLoaded", formatTimestamp);</script>'  # noqa: E501
 )
 if os.getenv("MNE_FULL_DATE", "false").lower() != "true":
     copyright = f"2012–{td.year}, MNE Developers. Last updated locally."  # noqa: A001
@@ -776,7 +776,7 @@ def fix_sklearn_inherited_docstrings(app, what, name, obj, options, lines):
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
 # documentation.
-switcher_version_match = "dev" if ".dev" in version else version
+switcher_version_match = "dev" if ".dev" in release else version
 html_theme_options = {
     "icon_links": [
         dict(