Implement RAC Style Library into Aurora

[HaSistrunk]

fix #555
fix #658
fix #646
fix #664
fix #668
fix #700

Implements the RAC Style Library into Aurora including substantial UI redesign and app updates.

• Remove Bootstrap and AdminLTE styles
• Remove moment.js for datatables (machine_file_upload_time data is already defined via models and views in the format we display it in, so unless I'm missing something we don't need to define a date format in the templates).
• Use micromodal.js for modals instead of Bootstrap JS.
• Update Datatables.js to version 2.1.8 and jquery to 3.7.1, including updating Datatables implementation to align with more recent version. Evaluated alternatives with search and pagination options including Grid.js and Tabulator, but Datatables still seems to be the best option in terms of functionality and accessibility.
• Pull in Datatables css, but customize to update table cell padding, the sort icon styles for better contrast, and adjust search/select input widths to work with RAC styles.
• Use RAC styles header with dropdown menus instead of side navigation
• Add standard public RAC footer and secondary footer with links to Docs Site Aurora user guide, digital transfer guide, and DART docs (as requested by Collections Management).
• Use HTML progress element instead of Bootstrap progressbar in transfer table.
• Remove tab interface on /transfers page and /accession page.
• Add a new /accession/saved page for Saved Accessions and allow donor users access to saved accessions info.
• Replace /appraise page transfer details modal with a link in the table to the transfer details page.
• Remove pointer row script that allowed users to select an entire row as a link. Hard to make that work with assistive tech. Replaced with a value in table rows that serves as a link to more details.
• Improve alert pattern for aria-live announcements and to make all alerts manually dismissible so that they do not disappear without user action (both for improved accessibility).
• Implement focus management when things are deleted in the DOM.
• Fix delete_object_js script for Bagit and Rights org tables so that "there are no existing..." paragraph appears when table is deleted.
• Restructure BagIt Profile creation form to use fieldsets (checkboxes and radio buttons) instead of multiple select inputs for certain form fields. Remove formsets that were associated with the old approach.
• Simplify dashboard on homepage to remove chart.js, but still include useful data and add a hero with cta links.

Style Library updates

See styles repo PR 235 for associated updates made to style library based on its implementation in Aurora.

Other considerations

We have implemented Datatables serverside in Aurora. If we anticipate 1000s of rows of data (which we may, over time!) this makes sense. Otherwise, I'm not sure we need that and it could make maintaining local Datatables functionality easier to use a client side implementation. I haven't changed the implementation here, though. Could be worth revisiting as part of issue #646 .

[HaSistrunk]

Changes implemented after usability testing:

• Remove "required" on bag-it profile metadata form fields. This was causing an issue in editing an existing bag-it profile where a blank form field is added to the bottom of the form automatically, and then prevents the user from saving the edited form since that field is required before saving changes.
• Enable donor users to see "Saved Accessions" page (only the accessions from the user's org). Also updated fixtures to be able to test this in the app.
• Change header nav for donor users so that "My Organization" (/orgs/pk) is now under "My Profile" menu.
• Add DART docs link to footer

@helrond would you mind reviewing my last two commits related to allowing donor users to see the Saved Accessions to make sure I didn't miss anything?

[helrond]

One small thing.

[helrond]

Let's do it!