D-Net

Add a first draft for form validation and required fields

new version of mining library | manage projects/ content providers change togle text to button, change text, add padding | change text for help texts to be the same (page/ class help text)| reorder dashboard boxes

1. Manage content providers of community (Remove and Add) functionality added (manage-content-providers.component, add-content-providers.component, remove-content-providers.component, manageContentProviders.service)
2. Fix links to manage content providers page (app.component, dashboard.component)

1. env-properties.json: 'baseOpenaireLink' field added for base link of OpenAIRE portal.
2. remove-projects.component.ts: 'communityUrl' variable added to build url for community portal, as soon as the communityId changes.
3. remove-projects.component.ts: do not set status of searchUtils to NONE, to avoid 2 messages about no results....

1. add-projects.component: Links to project landing pages of OpenAIRE portal added.
2. remove-projects.component: Links to project landing pages of community portal added.
3. remove-projects.component: Modal to confirm removal of a project from the community added....

Remove missed counter for subject

Fix error in managers and subjects fields

1. domain/page.ts: 'connect' and 'openaire' fields added in Page.
2. 'connect' and 'openaire' fields added in Page Form (both default to true).

Fix adding undefined, empty managers and subjects in backend

layout changes | hide create/ edit/delete buttons from simple users | apply changes in functions from Session class