Bootstrap5 update

Dependabot dependency update

Update-2021

Bump eslint-plugin-import from 2.7.0 to 2.22.1

Bumps [eslint-plugin-import](https://github.com/benmosher/eslint-plugin-import) from 2.7.0 to 2.22.1.
- [Release notes](https://github.com/benmosher/eslint-plugin-import/releases)
- [Changelog](https://github.com/benmosher/eslint-plugin-import/blob/master/CHANGELOG.md)
- [Commits](https://github.com/benmosher/eslint-plugin-import/compare/v2.7.0...v2.22.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Updated 3 Packages and fixed data-table bug

Remove brandColors.scss

Issue #107 Resolved

Issue Resolved: https://github.com/puikinsh/Adminator-admin-dashboard/issues/107
When you want to run PHP on same page as of the content then your page should be having extension of '.php' instead of '.html'. I have changed the page name to .php and add the php content for post there itself as asked.
Now POST method is working and also displaying the data below the form. You can although show the data wherever you want.

Fix: Sidebar link indicator

Fix #127

loader fix for IE11 support

Fix typo in README.md

Update README.md

docs: update nav links

Add ISSUE_TEMPLATE

Display none when spinner inactive

Add datepicker form control to forms.html